Find out how the changing the concentration of hydrochloric acid will affect decomposition of calcium carbonate.

Marble Chips and HCL

Aim: the aim of this practical is to find out how the changing the concentration of hydrochloric acid will affect decomposition of calcium carbonate

Prediction : I made some prediction that the more concentrated The acid was the quicker the reaction would Happen and more hydrogen would be produce this would be that changing the concentration of the Acid will either make it go slower or quicker and more or less gas would-Be produced depending on whether the concentrations were more or less.

In a stronger acid there are more acid particles or hydrogen ions to collide at a faster rate this is called collision theory this happens because in a strong acid (2 mol) there are more hydrochloric acid ions these ions the more likely they are to bump into the marble chip but in a weak acid (0.1 mol) there are not as likely to bump into the marble chip basicly a weak acid (1.0 mol)is like walking down a corridor with one or two children this would be easy to get to get to your lesson but a stronger acid is like walking down a corridor with about 100 children and having to push your way to your lesson

2hcl + caco3 >cacl2 + h2o + co2

the mass of the marble chip is the same size each time I carry out this experiment because if I used a big bit of marble chip in a strong acid then if I used a small bit of marble chip in the same strength of acid then I would not no weather the marble or the acid was affecting the results so I will increase the acid concentration not the size of marble chip

Fair test- we must make sure that we use the same size, amount and ...

This is a preview of the whole essay

2hcl + caco3 >cacl2 + h2o + co2

Fair test- we must make sure that we use the same size, amount and the same mass of chips, this is because we want to keep the chips the same all the way through the experiment so that it will be a fair test and the results we be in relation to each other, otherwise there results will be completely different to what we will expect and it will ruin the experiment. We must also take our readings at the same intervals throughout the experiment i.e. I will take a reading every five seconds for all of my experiments.

Method

When doing my experiments I will use the same Process throughout. Once I have set up the apparatus I will measure out 25cm3 of acid in a measuring Tube and then pour it into a Becker .Then I will be ready with the stop watch and then quickly drop in the chips into the acid push on the bung and start the stop watch. This must all be done in a very short space of time. From there, I must take the reading from the volume in the gas syringe every five seconds very accurately until 25 secs is up must record the results in a table and then write it up neat later. The factors which may affect how well the experiment is how quickly the chips are put in and then the bung placed on and the stop watch pressed. Although this is a factor it is not really a major factor that will affect the end results, and as long as the time it all takes is kept Constant throughout then it should not matter too much. But I must remember that if I use 1 chip then I must use 1 chip roughly the same size all the way through on all the different Concentrations.

. Equipment- We will need a beaker, calcium carbonate chips, hydrochloric acid, a stop watch, a gas syringe and a bung on the top of beaker tube with a delivery tube connected to the gas syringe. I will also need a stand and a clamp to hold on to the syringe. And goggles

Range:

Strength of acid I used: 0.1 0.5 0.75 1.0 1.25 1.5 1.75 2.0

I will use each acid 3 times

Evaluating

I think that the experiment went very well. This is because I got all the results that I wanted and they look very good. The results were accurate and so I am able to make a good conclusion. From looking at my results I can see that there were no poor results which were a good thing and it proves that everything went very well. Even though the experiments went very well I decided to repeat one concentration of acid 3 times just to see if I could repeat the experiment and get roughly the same results, which is what I did do, and these to go very well. There was no real source of error in the apparatus along as it all was working well and the way it should have been. The only possibility was if the temperature of the acid had changed from when we did the first reading to the finish i.e. from when we did the first experiment, the acid hopefully would have been the same temperature.