6. Calcium hydroxide (\'\'slacked lime\'\') and sulfuric acid (H2SO4) react to p

Question

6. Calcium hydroxide (''slacked lime'') and sulfuric acid (H2SO4) react to produce calcium sulfate and water (H2O). a. What is the formula for calcium hydroxide? b. What is the formula for calcium sulfate? c. Write a balanced equation for the reaction. d. You want to react 5.5 moles of calcium hydroxide. How much of a 0.5M solution do you need? e. How many moles of sulfuric acid are needed to react with 5.5 moles of calcium hydroxide? f. You have a 0.82M sulfuric acid solution. What volume of sulfuric acid is required to complete your reaction?

Explanation / Answer

a. .Ca(OH)2(aq)

b. CaSO4(s

c.Ca(OH)2(aq) + H2SO4(aq) ---> CaSO4(s) + 2 H2O(l)

d. 0.5 M means 0.5 moles/L. You need 11 litres of an 0.5 M solution to have 5.5 moles Ca(OH)2.

e. From the equation you can see that 1 mole of Ca(OH)2 reacts with 1 mole of H2SO4. So, 5.5 moles of H2SO4 are needed.

f. As you saw at (c.) you need a total of 5.5 moles H2SO4. Since the concentration of the solution is 0.82 M, you need

5.5/0.82 = 6.7 litres of the solution.

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