Investigating The Rate Of Reaction Between Marble Chips And Hydrochloric Acid

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Investigating The Rate Of Reaction Between Marble Chips And Hydrochloric Acid

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

concentrations of 50cm3 using different volumes of water and acid.

Introduction

I am investigating how the rate of reaction between marble chips and

hydrochloric acid is altered when the concentration is changed. This

is the word equation for my investigation,

Calcium + Hydrochloric Calcium + Carbon + Water

[IMAGE]Carbonate Acid Chloride Dioxide

The symbol equation for my investigation is,

[IMAGE]CaCo3 + 2HCL CaCL2 + CO2+ H2O

Prediction

I predict that when I have a higher concentration I will have a faster

rate of reaction. Referring to Edexcel Science Revision Guide edited

by Mary James, the collision theory states that when there are more

particles, there are more collisions making the reaction faster (see

diagram). Also referring to Chemistry For You by Laurie Ryan, it

states "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.

Method

I will weigh out one gram of marble chips using a balance and put it

in a conical flask and add to it a concentration of 50cm3 using water

and hydrochloric acid. I shall start by filling up a measuring

cylinder with water and putting it in a water bath so I can record how

much gas has been given off. I shall then put my one gram of marble

chips measured using in a conical flask then add to that my

concentration of hydrochloric acid and water, put on the bung and

start the stop clock. I shall record how long it takes for 25cm3 of

gas to be collected.

The reason I chose to do this investigation was because I have