CHEM HELP PLS 30 POINTS!!

1. what volume of 0.20 M HCl (aq) is needed to titrate 50 mL of 0.10 M NaOH to the endpoint?
A) 10.0 mL HCl
B) 40.0 mL HCl
C) 25.0 mL HCl
D) 20.0 mL HCl

2. what is the molarity of a NaOH solution if 40 mL of the solution is titrated to the endpoint with 15 mL of 1.50 M H2SO4?
A) 1.13 M
B) 1.47 M
C) 0.56 M
D) 0.75 M

3. suppose that 10.0 mL of HNO3 is neutralized by 71.4 mL of a 4.2 x 10 ^ -3 M solution of KOH in a titration. Calculate the concentration of the HNO3 solution.
A) 1.0 x 10 ^ -2 M
B) 3.0 x 10 ^ -2 M
C) 5.5 x 10 ^ -2 M
D) 1.0 x 10 ^ -14 M

Answers

Answer 1
1. 25 ml
2. 0.56 M
3. 3.0x 10^-2 M
Step by step explanation as follow
Use the formula (Molarity x volume) = ( molarity x volume)
Answer 2
The volume of HCl needed is 25 mL The molarity of NaOH needed is 1.13 MThe concentration of HNO₃ is 3×10¯² M

1. How to determine the volume of HCl needed

Balanced equation

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

The mole ratio of the acid, HCl (nA) = 1The mole ratio of the base, NaOH (nB) = 1

From the question given above, the following data were obtained:

Volume of base, NaOH (Vb) = 50 mLConcentration of base, NaOH (Cb) = 0.1 MConcentration of acid, HCl (Ca) = 0.2Volume of acid, HCl (Va) =?

CaVa / CbVb = nA / nB

(0.2 × Va) / (0.1 × 50) = 1

(0.2 × Va / 5  = 1

Cross multiply

0.2 × Va  = 5

Divide both side by 0.2

Va = 5 / 0.2

Va = 25 mL (Option C)

2. How to determine the molarity of NaOH

Balanced equation

H₂SO₄+ 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2

From the question given above, the following data were obtained:

Volume of base, NaOH (Vb) = 40 mLConcentration of acid, H₂SO₄ (Ca) = 1.5 MVolume of acid, H₂SO₄ (Va) = 15 mL Concentration of base, NaOH (Cb) =?

CaVa / CbVb = nA / nB

(1.5 × 15) / (Cb × 40) = 1 / 2

22.5 / (Cb × 40) = 1 / 2

Cross multiply

Cb × 40 =  22.5 × 2

Divide both side by 40

Cb = (22.5 × 2) / 40

Cb = 1.13 M (Option A)

3. How to determine the molarity of HNO₃

Balanced equation

HNO₃ + KOH —> KNO₃ + H₂O

From the balanced equation above,

The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, KOH (nB) = 1

From the question given above, the following data were obtained:

Volume of base, KOH (Vb) = 71.4 mLConcentration of base, KOH (Cb) = 4.2×10¯³ MVolume of acid, HNO₃ (Va) = 10 mL Concentration of acid, HNO₃ (Ca) =?

CaVa / CbVb = nA / nB

(Ca × 10) / (4.2×10¯³ × 71.4) = 1

(Ca × 10) / 0.29988 = 1

Cross multiply

Ca × 10 = 0.29988

Divide both side by 10

Ca = 0.29988 / 10

Ca = 3×10¯² M (Option B)

Learn more about titration:

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Related Questions

Copper and silver are two examples of atoms that will form a(n) _____.

metallic bond
ionic bond
covalent bond
none of the above

Answers

Answer:

metallic bond but not completely sure

Explanation:

How many senses does the human body have?
O A. 3
B. 5

Answers

Answer:

B

Explanation:

sight, hearing, smell, taste and touch

Answer:

Most easiest answer..

There are 5 senses in human body.☺️

What pH does an acid have?

Answers

Answer:

The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic

Explanation:

Addition of _____________ to pure water causes the least increase in conductivity

Answers

organic molecules

because organic molecules does not dissociate in water

What happens when kmno4 is heated

Answers

Answer:

kmno4 is heated => k2mno4 + mno2 + o2

Hope this helps!

:)

Answer the questions using the drop-down menus.
Which is the independent variable in this experiment?
Which is the dependent variable in this experiment?
Which is a controlled variable in this experiment?

Answers

In the experiment to measure the heat absorbed by a material placed in

the Sun, we have;

The independent variable is either the angle of insulation or the type of materialThe dependent variable is the temperature of the materialThe controlled variable is the type of material when the angle of insulation is the independent variable and vice versa

What differentiates the given experimental variables?

The possible experiment is with regards to the factors that influence energy from the Sun

The factors investigated are;

The type of material and the angle of lighting (insulation) affects the absorption of heat

The independent variable is the variable that is the cause of the effect

measured in the experiment.

It is the variable that the researcher has control over or controls and

varies during the experiment to produce the measured effect.

In the above experiment, the independent variable are either ;

The angle of insulation or the type of material respectively

The dependent variable is the variable that is under test or that is being measured.

In the above experiment the dependent variable is the temperature of the material which can be measured

The controlled variable is the variable that remains the same or is held

constant during the experiment and can be used as reference to

compare the dependent variable.

In the experiment, the controlled variable are either;

The type of material when the angle of insulation is the independent variable or vice versa

Learn more about independent and dependent variables here:

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Answer:

angle of light

temperature of material

type of material

Explanation:

E d g e 22 !

how many number of electrons are in aluminium and nitrogen in their free state?​

Answers

Answer:

MRCORRECT has answered the question

Explanation:

13 electrons

So... for the element of ALUMINUM, you already know that the atomic number tells you the number of electrons. That means there are 13 electrons in a aluminum atom. you can see there are two electrons in shell one, eight in shell two, and three in shell three.

7 electrons

So... for the element of NITROGEN, you already know that the atomic number tells you the number of electrons. That means there are 7 electrons in a nitrogen atom. Looking at the picture, you can see there are two electrons in shell one and five in shell two.

What does the questions “how much?” and “how many?” have in common?

Answers

They both ask for an amount of something

What are three examples of acid-base reactions in cooking

Answers

Answer:

Lemon juice baking soda and vinegar

Explanation:

Which is the molar mass of Calcium?

Answers

Answer:

40.078 u

Explanation:

The metabolic oxidation of glucose, C6H12O6, in our bodies produces CO2, which is expelled from our lungs as a gas.
C6H12O6(aq) + 6 O2(g) → 6 CO2(g) + 6 H2O(l)

Calculate the volume of dry CO2 produced at body temperature (37°C) and 0.960 atm when 24.5 g of glucose is consumed in this reaction.

Answers

Answer:

[tex]\large \boxed{\text{21.6 L}}[/tex]

Explanation:

We must do the conversions

mass of C₆H₁₂O₆ ⟶ moles of C₆H₁₂O₆ ⟶ moles of CO₂ ⟶ volume of CO₂

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

Mᵣ:        180.16

         C₆H₁₂O₆ + 6O₂ ⟶ 6CO₂ + 6H₂O

m/g:      24.5

(a) Moles of C₆H₁₂O₆

[tex]\text{Moles of C$_{6}$H$_{12}$O}_{6} = \text{24.5 g C$_{6}$H$_{12}$O}_{6}\times \dfrac{\text{1 mol C$_{6}$H$_{12}$O}_{6}}{\text{180.16 g C$_{6}$H$_{12}$O}_{6}}\\\\= \text{0.1360 mol C$_{6}$H$_{12}$O}_{6}[/tex]

(b) Moles of CO₂

[tex]\text{Moles of CO}_{2} =\text{0.1360 mol C$_{6}$H$_{12}$O}_{6} \times \dfrac{\text{6 mol CO}_{2}}{\text{1 mol C$_{6}$H$_{12}$O}_{6}} = \text{0.8159 mol CO}_{2}[/tex]

(c) Volume of CO₂

We can use the Ideal Gas Law.

pV = nRT

Data:

p = 0.960 atm

n = 0.8159 mol

T = 37  °C

(i) Convert the temperature to kelvins

T = (37 + 273.15) K= 310.15 K

(ii) Calculate the volume

[tex]\begin{array}{rcl}pV &=& nRT\\\text{0.960 atm} \times V & = & \text{0.8159 mol} \times \text{0.082 06 L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1} \times \text{310.15 K}\\0.960V & = & \text{20.77 L}\\V & = & \textbf{21.6 L} \\\end{array}\\\text{The volume of carbon dioxide is $\large \boxed{\textbf{21.6 L}}$}[/tex]

what is the compound of scI2

Answers

Answer:

sulfur dichloride

Explanation:

SCl2 is the chemical formula for sulfur dichloride. This compound is made of only two elements, so it is a binary compound.

What Newton’s law is this a example of:

When a bullet is fired from a rifle through a small explosion. The rifle shooting the bullet is pushed backwards after the explosion.

Answers

Answer:

Newton's third law

Explanation:

every action has an equal and opposite reaction.

Newton’s third law!!!!!!!!!!!!!!!!

A radioactive isotope has a half life of 25 minutes. How many half lives have occurred after 175 minutes?
5
6
7
8
Will give Brainliest

Answers

Answer:

7

Explanation:

Ideal Stoichiometry

Barium oxide has a replacement reaction with lithium. Calculate the mass of Barium oxide needed to react with 34.67 g of lithium.

*equation needed and thorough explanation please*

A- 340.5
B- 383.0
C- 455.0
D- 256.8​

Answers

Answer:

the answer is 383.0

hope it is helpful

Calculate the molar mass of ammonium chloride

Answers

Answer:

53.491 g/mol

Explanation:

Create the chemical compound and find each individual element's molar mass. Lastly, add them up.

What is an example of a polyatomic ion

Answers

Answer: The hydroxide cation (OH -) and the phosphate cation (PO 4 3-) are both polyatomic ions.

Explanation:

Answer:

OH - and PO 4 3- are both polyatomic ions

Whats the answer to 7/2 × 1/5?​

Answers

The answer to the problem is 7/10

Answer:7/10

Explanation:multiply top and bottom

If a body was lying on their back when they died, and was moved to their front after 12 hours, where would one see the skin discoloration from pooling blood?

Answers

Answer:the parts of the body which is nearest to  the ground ie thier back will show discoloration

Explanation:

If the body remains at a position for long hours, the parts of the body which is nearest to  the ground can develop a skin discoloration as a result of pooling of blood in the tissues and this is called livor mortis, which tends to be permanent from 8Hours upwards.

Which of the following did Antoine Lavoisier correctly characterize as an element? light silicone dioxide mercury

Answers

Answer: mercury

Explanation: I looked up the answer to your question.

Answer:

Mercury

Explanation:

I did this question and I got it right.

Explain on any two materials that you would expect to use for the wheelchair (both back support and

arm support) with less generation of heat during the hot summers.

Answers

Answer:

In the backrest use materials where it is easy to clean and where they do not absorb fluids, in this way it would be cooler, such as an ecological leather simulator.

And in the armrest as well, but in both areas we must not rule out that if or if it should have even a minimum of padded surface so that the patient or the person who spends most of the day in the wheelchair does not suffer from joint pain.

Explanation:

Some wheelchair factories also implement modern chairs where they are made of stainless steel structures lined with padded material with perforated fabrics that allow breathing and aeration of body areas that have contact with the fabric.

1. Calculate the molarity of 35g of calcium chloride (CaCl2) that is dissolved in 850ml of water. (Calculate moles first)

a. 0.27M
b. 0.38M
c. 0.32M
d. 0.80M

2. Calculate the molarity of 90g of copper sulfate (CuSO4) when dissolved in 5 L of water.

a. 0.112M
b. 2.8M
c. 0.56M
d. 0.50M

3. What is the molarity of NaOH if 0.70 moles are dissolved in 250 ml of water?

a. 175,000M
b. 2.8M
c. 0.175M
d. 4M

4. How many moles of Lithium oxide (Li20) are in 2 L of solution with a molarity of 2.0M?

a. 1 mole
b. 2 moles
c. 0.2 moles
d. 4 moles

5. How many moles of NaCl are in 7.5 L of 0.5M?

a. 3.75 moles
b. 15 moles
c. 0.066 moles
d. 2.5 moles​

Answers

Answer:

yo I got same question do u know it

A child has a balloon in his house in the air conditioning. He goes outside with the balloon on a hot day. What happens to the temperature of the gas and volume of the balloon?

Answers

Answer:

There would be an increase in temperature and corresponding increase in the volume of the balloon

Explanation:

Charles law is been here

Charles law  states that the volume of a given mass of gas  is directly proportional to the temperature in Kelvin, provided that the pressure on the gas is kept constant. Mathematically Charles law can be represented thus;

V∝ T

Where V is the volume of the gas and;

T is the temperature.

Relating Charles Law to the question

The child moved outside from the room, constant atmospheric pressure is maintained.The temperature of the room is lower than the temperature outside.

From Charles law postulation, there would be an increase in volume because of the increased temperature, since our pressure is same.

Analysis: The limiting reactant(s) appeared to be
because

Answers

there is nothing with which it can react

Explanation:

The limiting reactant(s) prevents a reaction from continuing because there is none left.

Why do limiting reactants occur?

Identification of the limiting reactant makes it possible to calculate the theoretical yield of a reaction. The reason there is a limiting reactant is that elements and compounds react according to the mole ratio between them in a balanced chemical equation.

How do you get the limiting reactant?

The reactant that is consumed first and limits the amount of product(s) that can be obtained is the limiting reactant. To identify the limiting reactant, calculate the number of moles of each reactant present and compare this ratio to the mole ratio of the reactants in the balanced chemical equation.

Learn more about Limiting Reactant(s) here

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#SPJ2

How many times more acidic is a pH of 2 than a PH of 7?

Answers

Answer: 10 times more

Explanation:

The Sun is a constant supply of energy to Earth.
A. True
B. False

Answers

True.
The sun gives the earth thermal energy, which warmth the planet and effects the weather and the seasons. Also the sun is the beginning of the food chain, because it allows for plants to grow.
We also get our energy either directly or in directly from the sun, either from our food that we eat, or through things like the burning of fossil fuels, which was once plant-matter millions of years ago.

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

A- increased algal blooms and damage to drinking water

B- increased plant growth and damage to drinking water

C- increase in denitrifying bacteria and increase in plant growth

D- increase in a limiting resource and increase in denitrifying bacteria

Answers

Answer:

The answer is B

Explanation:

Answer:

Which answer gives both a positive impact and a negative impact associated with the effects of nitrogen- and phosphorus-enhanced fertilizers?

1. increased algal blooms and damage to drinking water

Right Answer 2. increased plant growth and damage to drinking water

3. increase in denitrifying bacteria and increase in plant growth

4. increase in a limiting resource and increase in denitrifying bacteria

Explanation:

Which of these conclusions is correct about P and Q in the diagram?

P represents the land and Q represents the ocean.
P represents the ocean and Q represents the land.
P represents the land and Q represents the atmosphere.
P represents the atmosphere and Q represents the ocean.

Answers

P represents the atmosphere and Q represents the ocean.

Answer:

P represents the atmosphere and Q represents the ocean.

Explanation:

Write the full symbol for the isotope of oxygen having 8 neutrons.​

Answers

Answer:

Isotopes are forms of a chemical element that have the same atomic number but differ in mass. 16O → 8 protons + 8 neutrons; a “light” oxygen); The relative amounts are expressed as either 18O/16O or δ 18O Oxygen - 18 (aka 18O → 8 protons + 10 neutrons; a “heavy” oxygen).

Leon made a study chart about human-induced changes to
the environment.
Which headings best complete the chart?
Environmental Changes Caused by Humans
X: Habitat Destruction
Y: Pollution
Y
Results from
introducing harmful
substances into the
Results from natural areas
being cleared and replaced
by human development
© X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
0 X: Pollution
Y: Habitat Destruction
environment
Example: deforestation
Example: oil spill​

Answers

The question was not well arranged above. It has been arranged in the answer below.

Question:

Leon made a study chart about human-induced changes to the environment.

Environmental Changes Caused by Humans

X Y

Results from introducing harmful substances into the environment

Example: oil spill

Results from natural areas being cleared and replaced by human development

Example: deforestation

Which headings best complete the chart?

X: Habitat Destruction

Y: Pollution

X: Long-Term Changes

Y: Short-Term Changes

X: Short-Term Changes

Y: Long-Term Changes

X: Pollution

Y: Habitat Destruction

Answer:

X: Pollution

Y: Habitat Destruction

Explanation:

From the above question, Leon gave us two variables, X and Y.

The human induced changes were divided into two.

1. Results from introducing harmful substances into the environment

Introducing harmful substances into the environment is also called pollution. And we can represent this as X which is the first variable.

2. Results from natural areas being cleared and replaced by human development.

This description given in number two above whereby land areas are been cleared and replaced by human development has a negative effects on the environment because the vegetation which includes the trees are been cut down and living organisms(animals) will go extinct gradually. This act affect the balance of the ecosystem and it can be referred to as the destruction of the habitat of living organisms

Therefore, the correct headings best complete the chart is :

X: Pollution

Y: Habitat Destruction

Answer:

what the top person said

Explanation:

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