(CACO3) (HCL)
Diagram:
Equipment List
- Boiling/Test tube
- Delivery Tube with Bung
- Measuring Cylinder
- Stop Watch
- Plastic Tray
- Test Tube Holder
- Acid
- Safety Goggles
- Clamp & Boss
Methods to be Used
I am going to place 12cm³ of hydrochloric acid into a boiling tube with 5g of limestone pieces. Then immediately placing the bung on as it starts to react, and then pressing the stop watch and waiting 15 seconds each time and measuring how much watch is left in the measuring cylinder. I will do this 3 times with every amount of acid, 3 with 12cm³ and then with 10cm³ Acid and 2cm³ of Distilled water, all the way down to 4cm³ Acid and 8cm³ of Distilled Water.
Prediction
I think that with less acid added the reaction will be slower and won’t produce as much carbon dioxide and this won’t empty all the water out of the cylinder. I think this because the fact that the smaller amount of Acid and the bigger amount of water. The amount and rate of the reaction collisions will be smaller than with has only acid with no water
Fair Test
To make this test fair, I am going to always us 5grams of limestone chips and I will make sure that the measuring cylinder is always full to the brim and to make sure I always record my results every 15 seconds. I will always add 12cm³ of liquid (Acid and water) into the boiling tube. I am going to get 3 results for every experiment.
Results
1st Test – 12cm³ of Acid, No Distilled Water
This shows that the experiment ended very quickly. It only took 30seconds for all the gas to empty out of the measuring cylinder.
2nd Test – 10cm³ of Acid, 2cm³ of Distilled Water
This shows that the experiment took 45 seconds to empty the measuring cylinder.
3rd Test – 8cm³ of Acid, 4cm³ of Distilled Water
This shows that it took 45 seconds to empty the measuring cylinder.
4th Test – 6cm³ of Acid, 6cm³ of Distilled Water
This shows it took 120 seconds to empty the measuring cylinder
Test 5 – 4cm³ of Acid, 8cm³ of Distilled Water
This shows that it took 120 seconds to completely empty the measuring cylinder.
Conclusion
My results show that the more acid, the quicker the reaction happens and less amount of time it takes. The bigger amount of water the slower reaction and it takes longer to remove, empty the water in the measuring cylinder. This is because the larger the amount of acid, the more particles there is, the particles collide with the limestone. If you added more water than Acid, there are less acid particles to collide the limestone with.
Evaluation
My results clearly show that all the things I have mentioned in the conclusion were about right. My results did show that the more acid the faster the reaction. I could see this because looking at my results they show that with less acid and more water the more time it takes for the reaction to end
The results of experiments1 to 5 were all a little different. Experiments 1 2 & 3 all ended after about 45 seconds. But 4 & 5 took 120seconds to end. Experiments 1 and 5’s 3rd test is very different to the 1st two. They show bigger volumes of gas, but the 1st and 2nd are quite close together. This may have occurred because the experiment wasn’t done all at the same time, or was done with less accuracy.
I could have made the test more accurate and avoided the anomalous by doing all the experiments at the same time to avoid things changing and try to find a better way of measuring the Acid and Distilled Water more accurately.
