What is the molarity (in mol/L) of the NaOH solution?

Question

A beaker containing 0.400 g KHPwas titrated with NaOH solution. The pale pink end point was reached after 19.24 mL of NaOH solution was dispensed. What is the molarity (in mol/L) of the NaOH solution?

Answer 1

The chemical formula for KHP is KHC₈H₄O₄

NaOH(aq) + KHC₈H₄O₄(aq) → KNaC₈H₄O₄(aq) + H₂O(l)

0.400g KHP x 1 mole KHP = 0.00196 moles KHP

204.2g KHP

0.00196 moles KHP x 1 mole NaOH = 0.00196 moles NaOH

1 moles KHP

19.24 mL NaOH x 1L NaOH = 0.01924 L NaOH

1000 mL NaOH

Molarity = moles

L

Molarity = 0.00196 moles NaOH

0.01924 L NaOH

= 0.102 M NaOH