Neutralization, Concentration, Molarity

Problem Set

 

 

1. Complete the neutralization reaction:

HClO4 + NaOH

2. If you add 300 mL 0.2 M HC2H3O2 to 650 mL water, what is the new concentration of the acetic acid solution?

 

 

 

3. 250 mL of 0.5 M HCl is reacted with 100 mL of 1.0 M Ca(OH)2. What is the limiting reagent?

 

 

 

 

 

4. How many moles of water are formed?

 

 

 

 

5. What is the molarity of the calcium hydroxide solution?

 

 

 

 

6. A 3 g sample of a soluble chloride is titrated with 52.60 mL of 0.2 M AgNO3. What is the percentage of chloride in the sample?

 

 

Stoichiometry and Concentration in ppm/ppb

Problem Set

1. What is the concentration of barium in ppm if 2.000 g of BaCl2 are dissloved in 6.00 L of water?

In our labs we formed AlCl3 to precipitate out the copper metal. The reaction was

3CuCl2 + 2Al 3Cu0 + 2AlCl3

2. If we added a solution of 25 ppm Al to a bucket of CuCl2, how many milligrams of copper would be formed?

 

 

 

 

3. Remember we formed CuCl2 by adding 6 M HCl to CuO. What’s the concentration of Cu2+ in ppm if 0.013 g of CuO is added to 0.5 L of 6 M HCl? (the density of 6 M HCl is 1.19 g/mL)

 

 

 

 

 

 

4. In the beginning of the copper experiment, we added NaOH to form Cu(OH)2 from a solution of Cu(NO3)2 . The Cu(NO3)2 was formed by dissolving the Cu0 in HNO3. If .0013 g of copper were dissolved in 100 mL of 12 M HNO3, how much 6 M NaOH is needed to neutralize the excess HNO3 before Cu(OH)2 could be formed?

 

 

 

 

 

 

 

 

5. What is the concentration in ppm of the Na+ ions in the solution? (assume the density of 12 M HNO3 is 1.30 g/mL and 1.05 g/mL for 6 M NaOH)

 

 

 

Practice Problems: If you can do these, you should get at least a B+ on the test!

a) If I mix 1 L of H2O with 125 mL of 6 M hydrochloric acid, what is the new concentration?

b) How many grams of sodium hydroxide do I need to make a 3 L bottle of 3.5 M solution?

c) If I have 10 mL of concentrated nitric acid(12 M), how much water do I need to add to make a 0.5 M solution?

d) How many mL of 2.0 M barium hydroxide is needed to neutralize 100 mL of 4.5 M sulfuric acid?

e) How many grams of CuSO4 are needed to form 45.0 g of CuSO4 * 5 H2O? (Assume unlimited water)

CuSO4 + 5 H2O CuSO4 * 5 H2O

f) If I add 27.4 g of calcium carbonate to 125 mL of 2.20 M hydrochloric acid, how many grams of carbon dioxide is given off? What is the limiting reagent?

CaCO3 + HCl CaCl2 + H2O CO2 (Not Balanced)

g) If I mix 135 mL of 2.5 M potassium hydroxide with 238 mL of 0.6 M magnesium sulfate, how much magnesium hydroxide is formed? What is the limiting reagent?

KOH + MgSO4Mg(OH)2 + K2SO4 (Not balanced)