Question: 1. What is a back-titration? 2. Why is a back titration necessary in this experiment? 3. Calculate the number of moles of base equivalents in:

1. What is a “back-titration”?

2. Why is a back titration necessary in this experiment?

3. Calculate the number of moles of base equivalents in: a) 675mg CaCO3 b) 135 mg Mg(OH)2 - Base equivalents = number of moles ofacid (H+ ) consumed

4. Calculate the number of moles of acid (H+ ) in 33.6 mL of (a)0.10 M HCl and (b) 0.10 M H2SO4.

5. Calculate the pH of each of the following solutions: a) 0.10M HCl b) 2.0 x 10-4 M HNO3 c) 0.015 M NaOH d) 12 M HCl

6. Suppose that the pH meter indicates that the pH of threesolutions is 2.00, 7.15, and 10.50, respectively. Calculate the[H3O+ ] of each of these solutions in molarity.

7. What quantities are plotted on the x- and y-axes of anacid-base titration curve?

8. What do the rapid changes or “breaks” in a titration curverepresent?

9. What does the equivalence point in a titration represent?

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