Lab Report Investigating the Rate of Reaction Between Marble Chips and Acid when Variables are Changed

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Investigating the rate of reaction between marble chips and acid when variables are changed

Aim: to find out how changing the concentration of acid by diluting it affects the rate of reaction.

Planning: I will use marble chips and different concentrations of hydrochloric acid and water to see how it affects the rate of reaction. I will use 30ml of liquid made up of different concentrations of acid diluted with water.

Introduction: I have decided to vary the concentration of the acid as my variable I could have chosen other variables to change such as changing the heat of the acid, the size of the marble chips and many others variables. The word equation for this reaction is Marble + Hydrochloric , Carbon + Water + Calcium Chips Acid Dioxide Chloride and the symbol equation for this is CaCl + CO2 + H2O so CaCO + HCl , CaCl + CO2 + H2O.

Apparatus:

A Stop Clock - To determine how long it takes to collect enough gas to fill the measuring cylinder.

A Water Bath - To stop the water escaping from the measuring cylinder.

A Measuring cylinder - To measure the amount of gas that is given off.

A Chronicle Flask - Contains the marble chips, hydrochloric acid and the water that will make the reaction.

A Tube - To connect the conical flask to the measuring cylinder.

Method: Firstly, I will measure out 0.5 grams of powdered marble chips. Next I will measure out different concentrations of acid, these concentrations are, 30ml acid no water, 25ml acid 5ml water, 20ml acid 10ml water and 15ml acid 15ml water. I will then put the powdered marbled chips in the chronicle flask along with the acid and put the stopper on top. I will then record how long it takes for it to fill the measuring cylinder up. I will repeat each experiment 4 times so I can work out an average

Prediction: I predict that when I have a higher concentration I will have a faster rate of reaction. I believe this is so because as you increase the concentration of the acid, there are more acid particles in the same volume. Therefore there is a greater chance of acid particles colliding, and reacting with more particles on the surface of the marble. So, this means that the higher the concentration of my acid the faster the reaction.

Results:

Test/acid strength 30ml acid no water 25ml acid

5ml water 20ml acid

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