Question

1.Calculate the mass of malonic acid (C₃H₄O₄, MW 104.07 g/mol) required to prepare 50.00mL of a 0.15 M malonic acid solution.

2. Calculate the mass of manganese sulfate monohydrate (MnSO₄*H₂O, MW 169.01 g/mol) required to prepare 50.00mL of a 0.020 M manganese sulfate solution

3. Calculate the mass of potassium iodate (KIO₃,MW 213.99 g/mol) required to prepare 50.00mL of a 0.20 M potassium iodate solution.

4. Calculate the volume of 1.0 M sulfuric acid (H₂SO₄) required to prepare 100.00mL of a 0.080 M sulfuric acid solution. Use the formula M₁V₁=M₂V₂

5. Calculate the volume of 30% (w/w) hydrogen peroxide (H₂O₂) required to prepare 25.00mL of 6% hydrogen peroxide. Use the formula M₁V₁=M₂V₂

Answer 1

1)

0.15 M malonic acid

Molarity = (mass / MW ) x 1000 / volume

0.15 = (mass / 104.07 ) x 1000 / 50

mass = 0.78 g

2)

Molarity = (mass / MW ) x 1000 / volume

0.02 = (mass / 169.01 ) x 1000 / 50

mass = 0.169 g

3)

Molarity = (mass / MW ) x 1000 / volume

0.20 = (mass / 213.99 ) x 1000 / 50

mass = 2.14 g

4)

M1 V1 = M2 V2

1 x V1 = 0.08 x 100

V1 = 8.00 mL