Page 106 - Pharmaceutical Analytical Chemistry III

WATER ACIDITY (pH < 7)

It is caused by dissolved carbon dioxide "free carbonic
acid", mineral acids and salts of strong acids and weak
bases.
❑ DETERMINATION : (Titrimetry)

(a) Total acidity : water sample is titrated  st. alkali
(NaOH) using ph.ph. indicator.

(b) Mineral acids acidity : water sample is titrated  st.
alkali (NaOH) using M.O. indicator.

 * The acidity is calculated as ppm CaCO3.