Page 57 - Statistics presented by Dr. Sara Ismail Aborass
P. 57

9/8/2023

                 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.

111

              GRAVIMETRIC ANALYSIS

112

                                                                                                                         56
   52   53   54   55   56   57   58   59   60   61   62