Water Analysis : To Estimate Calcium Hardness of Water

AIM: TO ESTIMATE CALCIUM HARDNESS OF WATER
PRINCIPLE:
When addition of EDTA is applied to water containing both Ca & Mg, it combined with Ca first. Ca can be determined directly by EDTA when the pH is sufficiently high, Mg(OH)₂ and the indicator is used that combines with only calcium murexide indicator give a color change from pink to purple. When all the Ca has been complexed by EDTA at pH 12 to 13

  • WHO(1963): 75mg/l as maximum acceptable

  •  ISO(10500:1991): 5mg/l as maximum permissile ]

REQUIREMENT:
  •  8% NaOH solution
  • Mururide indicator: ammonium purpurate = 0.2gm
  • NaCl  = 100gm
  • Std EDTA solution (0.01m)
  • EDTA = 3.723 gm + 1000 ml D/W

PROCEDURE:
-          Take 25 ml of sample and dilute to 50ml by using D/W
-          Add 1ml NaOH to rise the pH to 12 to 13.
-          Add a pinch of murexide indicator.
-          Titrate  immediately by slandered EDTA till pink color changes to purple. Note down the volume of  EDTA.
-          Run a reagent blank and note down with used that (B).
-          Calculate the amount of EDTA required by sample (C = A – B)
-          Use the following formulae and calculate the concentration of Ca (mg/l) and Ca hardness  as CaCO₃ (mg/l)
1.    Ca as CaCO₃ mg/l =  ( C * 400.8)/ ml of Sample
2.    Ca hardness as CaCO₃ mg/l  =  ( C * 1000 * X) / ml of Sample

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