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How Do You Measure Alkalinity Of Water Samples?

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Alkalinity
Reagents or Solutions
1- Standard Sulphuric acid solution
(a) Stock Solution of 1N Sulphuric acid (H2SO4)
24.74 ml of sulphuric acid is taken in a 1000ml volumetric flask and dilute up to the mark with distilled water.
(b) Working Solution OR 0.02 N Sulphuric acid Solution
20 ml of stock solution or 1 N solution is taken in 1000 ml volumetric flask and dilute up to the mark with distilled water.
2- Standard Sodium nitrate Solution
(a) Stock Solution of 1N Sodium nitrate (NaNO3)
53 g of sodium nitrate was dissolve in 1000 ml distilled water.
(b) Working solution OR 0.02 N Sodium nitrate
20 ml of stock solution was taken in a 1000ml volumetric flask and dilute up to the mark with distilled water.
3- Methyl orange indicator
Dissolve 0.1 g methyl orange powder in 100 ml distilled water
Procedure:
50 ml sample is taken in a titration flask. Then titrate against 0.02 N Sulphuric acid to the methyl orange end point.
Calculation:
Alkalinity as CaCO3 mg/L= A´N´50000/ml of sample
A= ml of sulphuric acid used
N= Normality of sulphuric acid (Fzanson A, M. 1985).
All the readings are to be calculated and compiled in tabular form. Then there mean is found. We analyze this parameter both for drinking water and sewage.

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