Rate of Reaction
After doing my pilot run, i think that my method and apparatus used should be mostly the same:
Apparatus - 1 conical flask
- 1 lamenated 'x'
- 3 test tubes
- 1 thermometer
- 1 stop watch
- 3 pipettes
Method:
1. Measure 10ml of 0.2mol/dm3 or 0.2moldm-3 sodium thiosulphate 2. Pour it into the conical flask
3. Add 40ml of distilled water for dillution.
4. Then add 5cm3 of dilute hydrochloric acid of concentration
2mol/dm3 at room temperature
5. Record the temperature of the mixture. Stir mixture gently.
6. Stir mixture gently
7. Start time when all is stirred and when the conical flask is over the 'X' paper.
8. Once the cross is completely out of sight due to the reactionof the sodium thiosulphate and hydrochloric acid and then record the time.
9. I willl then repeat this with different measurements of sodium thiosulphate and water.
Changes I have made and why
- I am not going to be using a burette because after finishing my pilot run, i realised that i was gradually getting more and more behind schedule and I wouldn;t have enough time to complete my obtaining evidence if I were to carry on using it.
Fair test
To make sure it was a fair test. i had to constantly keep cleaning and washing the equipmentas any remaining substances can cause major differences in the results. And we had to try ansd hope that the room temperature will remain constant during the course of my experiment.
Also we always have to keep the volume of concentrstion the same -
55ml.
number and range of experiments
- If I have enough time, I would like to try around nine different concentrations of sodium thiosulphate with water. I am going to try hte following volumes of sodium thiosulphate: 10ml, 15ml, 20ml,
25ml, 30ml,35ml, 40ml,45ml and 50ml.
- I have chosen a range of 40ml as I think this is enough to truly experience the various actions of sodium thiosulphate reacting with hydrochloric acid.
- If any of my results seem somewhat innaccurate or faulty, I will try my best to redo them.
Safety
- Make sure to tie hair back.
- Wear a lab coat.
- Wear safety glasses or goggles.
- Wash hand in between each experimewnt and after anmd before eating.
- Open windows so the smell isn't too overwhelming
Dillutions
To make my experiment a fair test, we must always have the same volume of solutions, 55ml.
this is the best volume to use as it is about ¾ of a test tube full,
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Rate of Reaction Between Calcium Carbonate and Hydrochloric Acid Plan: In my experiment I will measure the rate of reaction between calcium carbonate and hydrochloric acid. The rate of the reaction is the speed that the reaction takes place so by measuring the rate I will measure the amount of time the reaction takes. Hydrochloric acid is a strong acid that is found in digestive juices in the stomach, it is also used for cleaning metals before they are coated. Calcium carbonate has a few forms including chalk and limestone the main use of these two materials is in the making of concrete, which is used for many things such as buildings. When you put calcium carbonate and hydrochloric acid together they react to form calcium chloride, carbon dioxide and water.
from 10cm to 50cm to make it easier to see the difference in a graph.
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