Charlie Durber 04/05/07
How Does Changing the Concentration Of Hydrochloric Acid Affect the Speed It Reacts With Marble Chips?
Introduction:
I am going to see if changing the concentration of acid affects the speed at which it reacts with marble chips.
Marble chips + Hydrochloric acid Carbon dioxide + Water + Calcium chloride
CaCO3 + HCl CO2 + H2O + CaCl2
I will measure how much gas is given off by using a tally counter to count how many bubbles of gas are given off and measuring the volume of gas produced.
Diagram:
Apparatus:
5g medium marble chips
50ml HCl
2 measuring cylinders
Conical flask
Bung and plastic tubing
Tub of water
Clamp
Stopwatch
Tally Counter
Method:
- Set up apparatus as shown, minus the HCl.
- Add the HCl and make sure the bung is inserted as soon as all the HCl is in the flask. Also, make sure the stopwatch is started then, so that none of the reaction is missed.
- Start measuring the volume of gas, taking readings every 10 seconds. Start the tally counter after a minute so that all the air from the conical flask is expelled and not mistaken for CO2.
- Take 8 readings and repeat the experiment twice so that you have 3 sets of readings. Use the average readings.