Question

Calculate the hardness of water sample whose 20 ml requires 30 ml of edta solution

Answer 1

Answer:

20 ml of CaCl² solution, whose strength is equivalent 1.5 g of CaCO³ per litre, required 30 ml of EDTA solution.

So, 1 mL of EDTA = 30/30 = 1 mg CaCO³ eq. hardness. = 10×1= 10 mg of CaCO³ eq.