The Rate of Reaction Between Marble Chips and Hydrochloric Acid

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I will set out my equipment as shown in the diagram below-

Throughout the experiment I was ready with the stopwatch, so that I started and stopped it immediately it was necessary to get accurate readings.

Once I have set up the apparatus I will measure out 5cm of acid in a measuring tube and then pour it into the conical flask. I will quickly place the chips into the acid, insert the bung in the top of the boiling tube and start the stopwatch. This must be done in as short a space of time as possible. From then on, I must take the reading of the volume in the gas syringe after a certain point is reached. I used eight different molarities of hydrochloric acid and then recorded the amount of carbon dioxide in the gas syringe. I will accurately record these roughly in a table and write them up neatly later.

I will take into consideration that the speed with which I put in the marble chips, place in the bung and press the stop watch may well affect how well the experiment works. Although these factors will affect the end result so long as they are kept constant throughout then it should not matter too much.

To get the best possible results I need to use the equipment in the best possible way, I could twist the gas syringe back and forth so as not to get the syringe stuck, which would affect my results. I will need three readings for each concentration and later if I need to repeat any experiments I can.

An important point is that I must use the right amount of acid and the best sized amount of marbles. If I used about 4 chips for 4ml acid then too much gas will be produced and the syringe will go over the 100 mm area in the syringe very quickly. Then I would not be able to take correct readings.

To overcome this problem I will test to see how many chips and what size will be the best to use. This is where my trial experiment that I did before I started came in handy because it allowed me to know what amount and size of chips to use in the proper experiment.

I also did an experiment beforehand to give an idea as to what to do in our investigation. It was the reaction between marble chips and hydrochloric acid. This was a very good thing to do because it showed me how to use the equipment properly and safely and gave an idea as to what was to come.

Evidence obtained

Molarity Time 1 Time Average Time

0.50 .51 .4 .45

1.00 1. 1.17 1.185

1.50 0. 0.45 0.85

1.75 0.44 0. 0.415

.00 0. 0. 0.4

.5 0.8 0.7 0.5

.50 0.6 0.5 0.05

.00 0.5 0.5 0.

Evaluating Evidence

I think that the experiment went very well.

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