Chemistry
Concentration EXTRA Practice 1
Minniear
1. Calculate the molarity of a solution that contains 4.50 grams of HCl in 1.50 L of solution.
2. Calculate the mass of Mg(OH)2 required to prepare 3.50 L of a 0.02000 M solution of
Mg(OH)2.
3. Calculate the volume of a 12.0 M H2SO4 solution required to prepare 2.00 L of a 0.500 M
solution of H2SO4.
4. Calculate the number of moles of H2SO4 and mass of H2SO4 in 750.0 mL of 1.5 M H2SO4(aq)?
KEY FOLLOWS
Chemistry
Concentration EXTRA Practice 1
Minniear
This is a new practice, so please let me know if you catch an error! Thanks 
1. Calculate the molarity of a solution that contains 4.50 grams of HCl in 1.50 L of solution.
)= 0.1234 mol HCl
First, convert g HCl to moles HCl
Molar mass HCl
Molarity
problem
2. Calculate the mass of Mg(OH)2 required to prepare 3.50 L of a 0.02000 M solution of
Mg(OH)2.
Molar mass Mg(OH)2
3. Calculate the volume of a 12.0 M H2SO4 solution required to prepare 2.00 L of a 0.500 M
solution of H2SO4.
Two molarities - good clue that this is a dilution problem.
M1V1=M2V2
(12.0 M)(V)=(0.500 M)(2.00L) = 0.08333 → 0.0833 L
So, 0.0833 L of 12.0 M H2SO4 dissolved into 1.917 L of water makes 2.0 L of 0.500 M H2SO4
Chemistry
Concentration EXTRA Practice 1
Molarity
problem
4. Calculate the mass of H2SO4 in 750.0 mL of 1.5 M H2SO4(aq).
= 1.125 mol H2SO4
Molar mass H2SO4
Minniear