`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 ?

What is the molarity of 0.2N Na_2CO_3 solution ?

4L of water is added to 2L of 6M HCl solution. What is the molarity of resulting solution .

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)?

Mg^(2+) has 10 electrons What is the number of protons in it?

MnO_4^(-) ions are reduced in acidic condition to Mn^(2+) ions whereas they are reduced in neutral condition to MnO_2 . The oxidation of 25 ml of a solution X containing Fe^(2+) ions required in acidic condition 20 ml of a solution Y containing MnO_4^(-) ions. What volume of solution Y would be required to oxidise 25 ml of solution X containing Fe^(2+) ions in neutral condition ?

If the density of methanol is 0.793 kg L^(-1) . What is its volume needed for making 2.5L of its 0.25M solution?

Calculate the molality of a solution containing 5.3 g of anhydrous Na2CO3 in 400 g water .

What volume of 10%(w/v) solution of Na_2CO_3 will be required to neutralise 100 mL of HCl solution containing 3.65 g of HCl?

5 g sample contain only Na_(2)CO_(3) and Na_(2)SO_(4) . This sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M H_(2)SO_(4) . Calcalute the % of Na_(2)SO_(4) in the sample .