Page 109 - Pharmaceutical Analytical Chemistry III

WATER ALKALINITY (p H > 7)
It is usually caused by the presence of strong or weak bases
dissolved in water (e.g. carbonate, bicarbonate, phosphate,
silicate and borate, …).
❑DETERMINATION : (titrimetry)
(a) Phenophthalein alkalinity :
Titrate water sample against st. acid using ph.ph. indicator.
(b) Methyl orange alkalinity :

Titrate  st. acid using M.O. indicator.
* The alkalinity is calculated as ppm CaCO3.