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My aim in this investigation is to investigate how temperature of hydrochloric acid affects its reaction with calcium carbonate (marble chips).

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Introduction

Chemistry Investigation (Coursework)- GCSE Aim- My aim in this investigation is to investigate how temperature of hydrochloric acid affects its reaction with calcium carbonate (marble chips). Introduction- My investigations main topic is rate of reaction and how temperature affects it, I will be mainly concentrating on how temperature affects the reaction of hydrochloric acid on calcium carbonate and what effect this has on the rate of reaction. The reaction I will be using for my investigation is: Calcium carbonate + Hydrochloric acid Calcium Chloride + Carbon dioxide + Water (Marble chips) I will carry out this reaction above using four different temperatures to find out if temperature affects rate of reaction. The rate of reaction can be measured in several ways: > Measuring the amount of gas given off by using a gas syringe in a given amount of time. > Measuring the time taken for reactants to dissolve. > By drawing graphs with the results obtained and then working out gradients (rate of reaction). There are many variables that affect the rate of reactions, I will go in more detail later. The rate of reaction depends upon the amount of collisions between particles, this is called the collision theory. The more collisions between particles in a given time, the faster the reaction. My aim is to investigate how temperature affects the reaction of hydrochloric acid on calcium carbonate and its rate of reaction. Therefore I found out factors that affect the rate of reaction from secondary resources, they are: > Temperature > Surface area > Concentration > Catalysts I am ...read more.

Middle

In other words the reaction with acid at 30?C will be the fastest reaction. Below is what I think my graph will look like: Preliminary Experiment- Before planning or starting to do my final experiment for my investigation, I have prepared a pilot test (preliminary experiment). With my pilot test I was investigating how temperature of hydrochloric acid affects its rate of reaction with calcium carbonate. I carried out two temperatures, 10?C and room temperature (25?C). Apparatus- > Hydrochloric acid > 30 marble chips > Gas Syringe > Ice > Thermometer > Glass beaker > Conical flask > Stop watch > Clamp > Safety goggles > Measuring cylinder Method (preliminary experiment) > I collected all my apparatus and set it out appropriately on the workbench. > Set my experiment up and made sure all my equipment was clean. > I measured 20ml of acid and poured it into my glass beaker. > I made sure it was at correct temperature by using a thermometer, to make the acid go down to 10?C I used the ice. > I added 15 marble chips in a conical flask and poured the acid in. > I then started my stopwatch, and every 10 seconds I took results. > I repeated the same process for room temperature. By carrying out this pilot test, I know what to do in the actual experiment and not make the same mistakes. I noticed that 20cm� of acid wasn't enough for my experiment to work properly so I instead I will use 30cm� of acid in my final experiment. ...read more.

Conclusion

> With a thermometer I will read the temperature of the acid. > Depending on the temperature needed I will either heat the acid on a Bunsen burner or cool it in an ice beaker. Room temperature is 25?C so for 15?C and 20?C I will place it in an ice beaker to cool the acid, and for 30?C I will place it on a Bunsen burner to heat the acid. > I will keep reading the thermometer to make sure the temperature is on level. > The first temperature I will do is 15?C, so I will put it in an ice beaker to cool. > I will keep the thermometer inside so I can constantly read the temperature and wait for it to reach 15?C. > While this is happening I will count 10 marble chips and keep them ready. > When the acid has reached the correct temperature I will pour the acid into a conical flask and put the 10 marble chips with it. > I will then seal it immediately with the rubber cork attached on to the gas syringe. > At the same time I will start my stopwatch. > Then every 10 seconds I will take readings off the gas syringe. > For each temperature I will repeat the experiment three times to get accurate and reliable results. I will use the same process each time as well. This is what my results table will look like: Time (seconds) Experiment 1 (Cm �) Experiment 2 (Cm �) Experiment 3 (Cm �) Average (Cm �) 10 20 30 40 50 60 70 80 90 Below is a diagram of my apparatus: ...read more.

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