Question

Calculate the carbonate and non-carbonate hardness of a water effluent in a textile industry. The analysis revealed that 50 mL of water sample required 12.5 mL of 0.01M EDTA solution and the titration after boiling the same volume of water sample consumed only 7 mL of EDTA. However, 20 mL of standard hard water (containing 1 g of CaCO3 per litre) consumed 20 mL of EDTA solution

Answer 1

Use dilution formula

M1V1= M2V2

0.01×12.5= 7×M2

M2= 0.125

Carbonation and non carbonate have 100molar

So non- carbonate = 100-.125= 99.87