Review Sheet : Ch 19 ; Obj. 19-25 Date

Chemistry Name : Review sheet : Ch 19 ; Obj. 19-25 Date :

A. Complete and balance the following neutralization reactions.

1. H2SO4 + Al(OH) 3 

2. HNO3 + Mg(OH) 2 

3. H3PO4 + LiOH 

4. H2CO3 + Ba(OH) 2 

5. Write and balance the following neutralization reaction and then determine how many moles of carbonic acid will be neutralized by the given amounts of lithium hydroxide or vice versa. (Assume all hydrogen atoms of carbonic acid will ionize).

H2CO3 + LiOH ---->

a. How many moles of carbonic acid are needed to neutralize 3.20 moles of LiOH ?

b. How many moles of LiOH are needed to neutralize 3.35 moles of H2CO3 ?

6. Write and balance the following neutralization reaction and then determine how many moles of nitric acid will be neutralized by the given amounts of magnesium hydroxide or vice versa.

HNO3 + Mg(OH) 2 --->

a. How many moles of magnesium hydroxide are needed to neutralize 2.50 moles of nitric acid?

b. How many moles of nitric acid are needed to neutralize .226 moles of magnesium hydroxide?

7. Calculate the unknown concentrations (in molarity) from the information given in the problem.

a. What is the concentration of a 100.0 mL solution of HCN which is neutralized by 50.0 mL of a .20M

solution of Ca(OH) 2 ?

b. What is the molarity of 50.0 mL of a solution of H2SO4 which is neutralized by 80.0 mL of a .50M solution of Al(OH) 3?

8. Determine the gram equivalent mass of the following acids or bases.

a. Al(OH) 3

b. HCN

c. H2CrO4 9. Calculate the normality of the following solutions from their given molarities.

a. .015 M H2SO4 = ______

b. .020 M H3PO4 = ______

c. .120 M Al(OH) 3 = ______

10. Calculate the normality of the following solutions.

a. 4.50 g of HNO3 in 200.0 mL of solution.

b. 35.0 g of Zn(OH) 2 in 500.0 mL of solution.

c. 6.20 g of H2CO3 in 350.0 mL of solution.

11. Determine the number of equivalents in the following.

a. 150.0 mL of a 2.5 N solution of nitric acid (HNO3).

b. .070 L of a .070 N solution of magnesium hydroxide (Mg(OH) 2).

c. 850.0 mL of a .500 N solution of potassium hydroxide (KOH).

d. 250.0 mL of a .10 N solution of phosphoric acid (H3PO4).

12. Solve the following dilution problems.

a. What volume would 150.0 mL of a 5.0N solution of sulfuric acid need to be diluted to to get a .050N solution of sulfuric acid?

b. What would be the normality of a solution made by diluting 200.0 mL of a .60 N solution of aluminum hydroxide to 500.0 mL?

13. Solve the following using the data given.

a. If 20.0 mL of .20 N hydrofluoric acid (HF)is used to neutralize 10.0 mL of an unknown base, what is the normality of the base?

b. 15.0 mL of a 3.0N acid is used to neutralize 50.0 mL of a base. What is the normality of the base?

c. What volume of a .15 N acid is needed to neutralize 40.0 mL of a .20 N base?

Answers to selected problems : 5a. 1.60 mol H2CO3 5b. 6.70 mol LiOH 6a. 1.25 mol Mg(OH)2 6b. .452 mol HNO3 7. 0.20 M HCN 7b. 1.2 M 8a. 26.00 g 9a. .030 N 9c. .360 N 10a. .357 N 10c. .571 N 11a. .38 eq. 11c. .425 eq. 12a. 15 L 13a. .40 N 13c. 53 mL