`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 ?

A sample of hard water contains 20 mg of Ca^(2+) ions per litre. How many millimoles of Na_(2)CO_(3) would be requried to soften 1 L of the sample. Also calculate the mass of Na_(2)CO_(3) .

A sample of hard water is found to contain 40 mg of Ca^(2+) ions per litre. The amount of washing shoda (Na_(2)CO_(3)) required to soften 5*0 L of the sample would be

Ca^(2+)" and "Mg^(2+)

One litre of sample of hard water contain 4.44mg CaCI_2 and 1.9mg of MgCI_2 . What is the total hardness in terms of ppm of CaCO_3 ?

One litre of a sample of hard water contain 4.44mg CaCl_(2) and 1.9mg "of" MgCl_(2) . What is the total hardness in terms of ppm of CaCO_(3)?

One litre of a sample of hard water contains 5.55 mg of CaCl_(2) and 4.75 mg of MgCl_(2) . The total hardness of ppm of CaCO_(3) is

A sample of hard water contains 1 mg CaCl_2 and 1 mg MgCl_2 per litre. Calculate the hardness of water in terms of CaCO_3 present in per 10^(6) parts of water.

A sample of hard water contains 1 mg CaCl_2 and 1 mg MgCl_2 per litre. Calculate the hardness of water in terms of CaCO_3 present in per 10^(6) parts of water. (a). 2.5 ppm (b). 1.95 ppm (c). 2.15 ppm (d). 195 ppm

A flask of 1.5 L capacity contains 400 mg of O_(2) and 60 mg of H_(2) at 100^(@)C . Calculate the total pressure of the gaseous mixture. If the mixture is permitted to react to form water vapour at 100^(@)C , what materials will be left and what will be their partial pressures?

The percentage of Mg^(2+) ions in a solution can be tested by adding a solution of