Chloride Ion (Argentometric)

Determine chloride concentration (ppm or mg/L) in water using AgNO₃ titration (Mohr's method).

Volume of AgNO₃ used (mL)

Normality of AgNO₃ (N)

Typically 0.0141 N for chloride determination.

Volume of water sample (mL)

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ppm Cl⁻

Chloride (ppm) = (V_AgNO₃ × N_AgNO₃ × 35.45 × 1000) / V_sample

35.45 = equivalent weight of Cl⁻; 1000 converts to ppm.

Mohr's method uses potassium chromate indicator – endpoint is brick‑red precipitate.
For accurate results, pH should be between 6.5 and 9.
If using conductometric titration, the same formula applies (volume at equivalence).