Question

I have a flask containing 100 ml of water, a jug having 1 litre of water and a bucket having 10 litres of water. I add 10 ml of 1 mole solution of HCl to all the 3 containers. Comment on the strength and concentration of the solutions in all the 3 containers. Answer methodically in points.

Answer 1

Given:  Flask containing 100 ml of water, a jug having 1 litre of water and a bucket having 10 litres of water. 10 ml of 1 mole solution of HCl is added to all the 3 containers.

To find: The strength and concentration of the solutions in all the 3 containers

Solution:

• We know that 37% of HCl has 12 mol/L

• Now, we have

                1kg x 0.37

             = 370 g of HCl

• In HCl  atomic mass is:

                35.5 + 1

                36.5 g/mol

• So now,  

                370 g / 36.5 g/mol

             = 10.137 mol / kg

• Also we know that  

                1l = 1.185 kg

                 10.137 x 1.185kg/l

              =12.0 mol/l

• Finally  x (12mol HCl) x 12mol/L) / 100ml = 0.025 mol / L

Answer:

             x (12mol HCl) x 12mol/L) / 100ml = 0.025 mol / L