50.00 mL of unknown calcium hydroxide solution is titrated with 0.250 M standard nitric acid solution. If 43.43 mL of the standard acid solution is required to reach a phenolphthalein endpoint, what is the molarity of the unknown calcium hydroxide solution

Molarity of the unknown calcium hydroxide solution is 0.217 M.

Explanation:

Given: = 50.00 mL,     = ?

= 43.43 mL,         = 0.250 M

Formula used is as follows.

Substitute the values into above formula as follows.

Thus, we can conclude that molarity of the unknown calcium hydroxide solution is 0.217 M.

the answer is d. 74.02