Answer: The molarity of NaOH solution is 0.039 M.
Step-by-step explanation:
To calculate the number of moles, we use the equation:

Given mass of KHP = 0.3420 g
Molar mass of KHP = 204.22 g/mol
Putting values in above equation, we get:

The chemical reaction for the formation of chromium oxide follows the equation:

By Stoichiometry of the reaction:
1 mole of KHP reacts with 1 mole of NaOH.
So, 0.0014 moles of KHP will react with =
of NaOH.
To calculate the molarity of NaOH, we use the equation:

We are given:
Moles of NaOH = 0.0014 moles
Volume of solution = 35.73 mL = 0.03573 L (Conversion factor: 1 L = 1000 mL)
Putting values in above equation, we get:

Hence, the molarity of NaOH solution is 0.039 M.