25.00 mL of unknown calcium hydroxide solution is titrated with 0.400 M standard nitric acid solution. If 38.04 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 unknown solution is 0.304 M.

Explanation:

Neutralization reaction:

So, 2 moles of neutralize 1 mol of

Moles of added =

So, 0.0152 mol of neutralize 0.00760 mol of

Let's assume molarity of is C (M)

Then number of moles of in 25.00 mL of C (M) of

=

Hence,

or, C = 0.304

So, molarity of unknown solution is 0.304 M

where's the diagram?

the answer is na (sodium)