`1L` of pond water contains `20mg` of `Ca^(2+) and 12mg` of `mg^(2+)` ions. What is the volume of a `2N Na_2 CO_3` solution required to soften `5000L` of pond water ?

5 kg of water contain 24 mg of MgSO_4 and 32.4 mg of Ca(HCO_3)_2 . The total hardness of water is

10.6 g Na_2CO_3 are dissolved in water to give 2 M solution. What is the volume of the solution in ml?

If 1 kg of water contains 12 mg of magnesium sulphate its degree of hardness is

To 50ml of 0.1 N Na -(2) CO_(3) solution 150ml of water is added . What is the molarity of result solution ?

A sample of pond water contains 40mg of organic matter requires 32mg of dissolved oxygen. If pond water contains 100mg of organic matter per two litres, BOD value of the water sample is.

1 kg of a sample of water contained 222 mg of CaCl_2 and 219 mg of Mg(HCO_3)_2 . The permanent and temporary hardness are .... ppm and .... ppm

If 1 kg of water contains 12 mg magnesium sulphate its degree of hardness is