Question

1. A student is asked to standardize a solution of sodium hydroxide. He weighs out 0.960 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 18.1 mL of sodium hydroxide to reach the endpoint.

A. What is the molarity of the sodium hydroxide solution? ___M

This sodium hydroxide solution is then used to titrate an unknown solution of hydroiodic acid.

B. If 12.8 mL of the sodium hydroxide solution is required to neutralize 27.8 mL of hydroiodic acid, what is the molarity of the hydroiodic acid solution? ____M

2. A student is asked to standardize a solution of barium hydroxide. He weighs out 0.960 g potassium hydrogen phthalate (KHC₈H₄O₄, treat this as a monoprotic acid).

It requires 18.0 mL of barium hydroxide to reach the endpoint.

A. What is the molarity of the barium hydroxide solution? ___M

This barium hydroxide solution is then used to titrate an unknown solution of hydrobromic acid.

B. If 20.1 mL of the barium hydroxide solution is required to neutralize 10.8 mL of hydrobromic acid, what is the molarity of the hydrobromic acid solution? ____M

3.Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

How many grams of KHP are needed to exactly neutralize 36.2 mL of a 0.159 M calcium hydroxide solution ?

______grams KHC₈H₄O₄

4. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC₈H₄O₄. This is often written in shorthand notation as KHP.

What volume of a 0.162 M calcium hydroxide solution is needed to exactly neutralize 1.53 grams of KHP ?

______mL calcium hydroxide