Example On Alkalinity Of Water
100 ml water sample required 30ml N/50 H2SO4 for phenolphthalein and another 20 ml for methyl orange end point for complete neutralization. Calculate alkalinity in terms CaSO4 and the type of alkalinity present.
Solution: Np × Vp = Na × Va
Np = 30/100×50
Strength Np × 50 × 1000
P = 300 ppm
NmVm = Na (V1 + V2)a
Nm = 50/100×50
Strength = Np × 50 × 1000
M = 550 ppm
Since P > 1/2 M the alkalinity is due to OH– and CO32–
Alkalinity is due to OH– = 2P – M = 100 ppm
Alkalinity is due to CO32– = 2(M – P) = 400 ppm
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