Question

Hydrochloric acid solution reacts with zinc according to the following equation:
2H3O + Zn -> Zn^2+ + H2 +2H2O

100ml of hydrochloric acid solution Ca=0.5mol/l must be prepared from C=5mol/l hydrochloric solution.
1) Specify the glassware needed for this preparation .

At time t=0 a volume Va=40ml of hydrochloric acid solution of concentration Ca=0.5mol/l is poured into a flask containing a mass 1g of powedered zinc . We admit that the volume of the mixture remains constant .
2) Explain the advantage of the use of powdered zinc instead of a zinc strip in this study.

Answer 1

If you want to dilute the solution from 5 M to 0.5 M, you must dilute by a factor of 10. You want 100 so take 10 mL and dilute to 100. For this you will need a 10 mL pipet and a 100 mL volumetric flask.

2. Powdered Zn has MUCH MORE surface area so the reaction is faster (MUCH FASTER).