Question

100ml M/100 Na2CO3 is added in 200ml simple hard water and the mixture is boiled and filtered. The filtrate is neutralized with 100ml M/100 HCl, then what is the permanent hardness of water?

Answer 1

Answer:

A 200 mL sample of hard water requires 33.0 " mL of " 0.01 M

for complete neutralisation. <br> 200 " mL of " the same sample was boiled with 15.0 " mL of " 0.1 M NaOH solution, filtered and made up to 200 mL again. This sample now requires 53.6 " mL of " 0.01 M