If is found that 24.68 ml of .1165 m naoh is needed to titrate .2931 g of an unknown acid to the phenolphthalein end point. calculate the equivlanet mass of the acid.

The equivalent mass of the acid is 83.16 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

Molarity of solution = 0.1165 M

Volume of solution = 24.68 mL = 0.02468 L

Putting values in equation 1, we get:

( as acidity of NaOH is 1)

For end point:  gram equivalents of acid =  gram equivalents of base =

Mass of acid=

Thus equivalent mass of the acid is 83.16 grams

c. 75.7

i think that is the right