Question

A 0.200 M NaOH solution was used to titrate a 18.25 mL HF

solution. The endpoint was reached after 31.20 mL of titrant
were added. Find the molar concentration of the original HF
solution.

Answer 1

The molar concentration of HF is 0.34 M

Step-by-step explanation:

Given data:

Molarity of NaOH =M₁ = 0.200 M

Volume of HF =V₂= 18.25 mL

Volume of NaOH added = V₁ = 31.20 mL

Molarity of HF solution = M₂ = ?

Solution:

M₁V₁ = M₂V₂

by putting values,

0.200 M × 31.20 mL = M₂ × 18.25 mL

M₂ = 0.200 M × 31.20 mL / 18.25 mL

M₂ = 6.24 M.mL / 18.25 mL

M₂ = 0.34 M

Thus, the molar concentration of HF is 0.34 M.