Practice - Molarity Questions!

18 Questions | By Pearsonk | Last updated: Mar 21, 2022 | Total Attempts: 241

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Concept and Calculations

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1.

What are the units for molarity?
- A.
  
  Moles per liter
- B.
  
  Liter per moles
- C.
  
  Moles per gram
- D.
  
  Grams per mole
2.

What is the dilution equation?
- A.
  
  M1V1 = M2V2
- B.
  
  M1V2 = M2V1
- C.
  
  M1V1 / M2V2
- D.
  
  Moles per liter
3.

15.8 g of KCl is dissolved in 225 mL of water. Calculate the molarity. Don't forget the units M.
4.

1.50 g of NaCl is dissolved in 100.0 mL of water. Calculate the concentration. Don't forget the units M.
5.

50.0 g of NaCl is dissolved in 200.0 mL of water, calculate the molarity. Don't forget the units M.
- A.
  
  4.31 M
- B.
  
  4.3 M
- C.
  
  4 M
- D.
  
  4.3103 M
6.

25.2 g of NaCl is dissolved in 365 mL of water, calculate the molarity. Don't forget the units M.
7.

150.0 g of NaCl is dissolved in 0.2500 L of water, calculate the molarity. Don't forget the units M.
8.

55.6 g of NaCl is dissolved in 0.562 L of water, calculate the molarity. Don't forget the units.
9.

Calculate the mass of KCl required to prepare 250. mL of 0.250 M solution. Don't forget the units g.
10.

Calculate the volume of 0.30 M KCl solution that contains 6.00 g of KCl. Don't forget the L.
11.

Calculate the volume of 0.250 M H₂SO₄ that contains 0.250 g H₂SO₄. Don't forget the L.
12.

How many moles of NaCl are in 250.0 mL of a 0.200 M solution. Don't forget the unit moles.
13.

If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be? Don't forget the units M.
14.

Which ice coffee would you expect to taste the least sweet?
- A.
  
  0.1 M
- B.
  
  2.5 M
- C.
  
  5 M
- D.
  
  4.8 M
15.

When you make a dilution, which of these values remains constant?
- A.
  
  The molarity (M)
- B.
  
  The total moles of solute
- C.
  
  The volume (V)
- D.
  
  The concentration
16.

As we dilute a solution...
- A.
  
  The volume increases and the molarity (M) increases
- B.
  
  The volume increases and the molarity (M) decreases
- C.
  
  The volume decreases and the molarity (M) increases
- D.
  
  The volume decreases and the molarity (M) decreases
17.

What does 44 M mean?
- A.
  
  44 molarity over liters
- B.
  
  44 moles per 1 liter
- C.
  
  44 molarity per liters
- D.
  
  44 liters per mole
18.

Compare the number of moles of solute before dilution with the number of moles of solute after dilution.
- A.
  
  Total number of moles in the solution doesn't change but the number of moles per liter changes
- B.
  
  Number of moles don't change before or after dilution
- C.
  
  Total number of moles gets less with dilution
- D.
  
  Total number of moles increases after a dilution