Marble chip investigation - rates of reaction, studying the effects of change in concentration of the acid

Marble Chip Investigation
Method
1.Set up the equipment as diagram shows. The measuring cylinder must be filled with water and then inverted into the tub.
2.Measure the quantity of hydrochloric acid and marble chips to the decided amount. Add water to the acid to change the concentration to what you need.
3.Take note of the amount of water in the measuring cylinder.
4.Put the marble chips and hydrochloric acid into the conical flask. Replace the bung and start the stopwatch.
5.Once the decided amount of time has passed, take note of the remaining amount of water in the measuring cylinde…