How much water should be added to 0.07 moles of KCL to prepare a 0.5m solution

                       Volume  =  0.14 L

Explanation:

                     This is a simple Molarity problem in which we are given with,

Moles  =  0.07 moles

Molarity  =  0.5 mol.L⁻¹

Volume  =  ??

Now, as,

            Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

                         Molarity  =  Moles / Volume of Solution   

So, Solving for Volume,

                         Volume  =  Moles / Molarity

Now, putting value of Moles and Molarity,

                        Volume  =  0.07 mol ÷ 0.5 mol.L⁻¹

                        Volume  =  0.14 L