basic

Percent Purity from Back-Titration Calculator

% purity = (n_analyte / n_theoretical) × 100.

Compute the percent purity of a sample using a back-titration: excess reagent B remaining after reacting with impure sample A is titrated by standard C. Moles of A that reacted = initial moles of B − moles of C used to titrate excess B. Purity = moles A reacted × M_A / sample mass × 100.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

mol/L
mL
mol/L
mL
g/mol
g

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

n_A = (n_B_initial − n_C_titrant) / stoichiometry; purity = n_A · M_A / m_sample · 100.

In depth

Compute the percent purity of a sample using a back-titration: excess reagent B remaining after reacting with impure sample A is titrated by standard C. Moles of A that reacted = initial moles of B − moles of C used to titrate excess B. Purity = moles A reacted × M_A / sample mass × 100.