Molarity question

[Xamfy19]

An amount of potassium acid phthalate (KHP) weighs 0.426 g. The KHP is dissolved in a small amount of water and titrated with 16.98 mL of NaOH. Calculate the molarity, M, of the NaOH.

The following is my answer, but it was wrong. Can anyone help? Thanks

Molecular weight of KHP = 71.08
0.426/71.08/0.01698 = 0.353

[slepsta]

The molecular weight of KHP is 204.22 g/mol. Assuming 16.98 mL was the amount needed to reach the end point your calculation is correct except for the molar mass of KHP.

[Xamfy19]

:smile: :smile: :smile:

[slepsta]

no problem