Lab Report: How the temperature of water will affect the reaction time of sodium thiosulfate and hydrochloric acid

by hannarokossagmailcom (student)

Lab report: How the temperature of water will affect the reaction time of sodium thiosulfate and hydrochloric acid

Hanna Rokossa

Date: Week of 5th February

Aim:

The aim of this investigation is to find out if the temperature of the water can affect the reaction time of sodium thiosulfate and hydrochloric acid.

Prediction:

I predict that during this experiment when we increase the temperature of the water the faster the reaction will take place.

Variables:

IV- The thing that we are changing is the temperature of the water
DV- The thing we will be measuring is the time that will be taken for the reaction to happen
CV- Amount of Water (100ml)
The time we start and stop the timer

Method:
1.Put on your lab coat and goggles

2.Gather all you equipment
3. Draw an 'x' on three pieces of papers
4. Add 100 ml of 10degrees water to a beaker. If the tap water is not cold enough add some ice to the beaker to decrease the temperature.
5. Measure 10 ml of Sodium Thiosulfate and add this into a flask.
6. Put the flask into the beaker containing water
7.Measure 5ml of Hydrochloric Acid and pour that into the flask containing the Sodium Thiosulfate.
8.Make sure to have a piece of paper with an 'x' underneath the beaker.
9. Record your results on your results table
10.Repeat steps 4 to 9 two more times, then calculate your average for that temperature.
11. Add 100 ml of 50 degrees water into the beaker.
12. Measure 10 ml of Sodium Thiosulfate and add this into a flask.
13. Put the flask into the beaker containing water
14.Measure 5ml of Hydrochloric Acid and pour that into the flask containing the Sodium Thiosulfate.
15.Make sure to have a piece of paper with an 'x' underneath the beaker.
16. Repeat steps 11 to 15 two more times to get the average
17. Record your results and calculate the average.

18.Add 100 ml of 100 degrees water into the beaker.
19. Measure 10 ml of Sodium Thiosulfate and add this into a flask.
20. Put the flask into the beaker containing water
21.Measure 5ml of Hydrochloric Acid and pour that into the flask containing the Sodium Thiosulfate.
22.Make sure to have a piece of paper with an 'x' underneath the beaker.
23. Repeat steps 11 to 15 two more times to get the average
24. Record your results and calculate the average
25.Clear up all your equipment and clean your working space.

Safety:

Make sure you always keep your safety glasses/goggles on throughout this experiment.
Do not remove your lab coat until you have completely finished the lab.
If you hair is long make sure to tie it up in the back
Do not touch any chemicals with your hand
Wash your hands after
Do not sit down
Make sure a equipment is in the middle of your working space so It does not fall down.

Apparatus:

Paper x3
Pen
Goggles
Sodium Thiosulfate
Hydrochloric Acid
Beaker
Flask
Stop Watch
Ice
Kettle
Measuring cylinder
Water
Lab Coat

Conclusion:

Before doing this experiment I predicted that the warmer the temperature of the water is the faster the reaction rate will increase.

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Safety:

Apparatus:

Paper x3
Pen
Goggles
Sodium Thiosulfate
Hydrochloric Acid
Beaker
Flask
Stop Watch
Ice
Kettle
Measuring cylinder
Water
Lab Coat

Conclusion:

Before doing this experiment I predicted that the warmer the temperature of the water is the faster the reaction rate will increase.

In this experiment we found out that the higher the temperature is the faster the reaction will take place but at one point the particles will stop to react and the reaction wont happen any faster it actually might decrease.

The averages of the times were;

10 Degrees Celsius: 6.2 Seconds

50 Degrees Celsius: 2.4 Seconds

100 Degrees Celsius: 2.4 Seconds

We got this result because increasing the temperature also increases the rate of reaction because as the temperature increases the reactant molecules move faster and collide with each other faster, which will give off more energy, and more activation energy will result in a faster reaction time.

Evaluation:
This experiment was a fair test, we tested each three times to make sure we are able to get an average of the time that the reaction has took to happen. I think that it could have been improved if we always started the stop watch at the same time as this varied (even only for a second) the test can be affected by this.
This lab experiment was a valid one as the results we got answered the original aim, for example; that the warmer the temperature of the water is the faster the reaction will be.

Most of our group’s results are precise as they are only an average of 0.2. Away from each other. There is one result in the temperature 10 Degrees Celsius that is not precise result.
My results were not entirely accurate as 50&100 Degrees had the same reaction time average (2.4 Seconds).

The results are mostly reliable as we got 8/9 tests done and had a reaction take place but for the last test for 100 degrees the reaction ended up not taking place.

If an error would have happened it would have been a human error for example if we added to much of one liquid this might also affect the time of the reaction.

Sources:

"Collision Theory (Temperature Effect)." Collision Theory (Temperature Effect). N.p., n.d. Web. 10 Feb. 2014.

"The Effect of Temperature on Rates of Reaction." The Effect of Temperature on Rates of Reaction. N.p., n.d. Web. 10 Feb. 2014.

“BBC News.” BBC, n.d. Web. 10 Feb. 2014.