A 25.0 mL sample of H3PO4 requires 50.0 mL of 1.50 M NaOH for complete neutralization. What is the molarity of the acid?

The molarity of acid is 3 M.

Explanation:

Given dа ta:

Volume of H₃PO₄ = 25 mL

Volume of NaOH = 50 mL

Molarity of NaOH = 1.50 M

Molarity of H₃PO₄ = ?

Solution:

Formula:

M₁V₁ = M₂V₂

M₁ = M₂V₂ / V₁

M₁ = 1.50 M * 50 mL / 25 mL

M₁ = 75 M. mL / 25 mL

M₁ = 3 M

The molarity of acid is 3 M.