I am investigating how the concentration of a solution affects the rate of reaction

Possible Input Variables

* Temperature

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* Concentration

* Surface area

* Stirring

Possible outcome variables

* Colour Change

* Any gases given off

My input variable will be: –

Concentration

My outcome variable will be: –

Colour Change

My Control Variables will be: –

* Volume of acid

* Volume of thio

* Shape of reacting vessel

* Temperature

Prediction

The more concentrated the Thio-sulphate solution the least time it takes to react.

Science Knowledge

Strong Acid Weak acid

If there are more molecules per CM3 they are more likely to collide so there would be a faster rate of reaction.

Equipment List

Goggles

Conical Flask

Thio sulphate

Acid

Measuring cylinder

2 beakers

Step-by-Step Procedure

1. Draw ‘x’ on a piece of paper.

2. Use a measuring cylinder to measure out 50cm3 of thio sulphate and a separate one. to measure out 5cm3 of acid. Always make sure that the glass wear is clean.

3. Place the beaker with 50cm3 of thio sulphate on top of the paper.

4. Add 5cm3 of acid into the solution.

5. Put your head over the beaker so you can see clearly when the ‘x’ disappears.

6. Time how long it takes for the ‘x’ to disappears.

7. Range – 50 thio/ 0 acid – 45 water/ 5 acid

Results

Thio Sulphate solution (cm3)

Water (cm3)

Time taken (secs) Average

50

0

58 53 55.5

45

5

61 69 65

40

10

77 79 78

35

15

87 89 88

30

20

94 94 94

25

25

106 105 105

20

30

110 134 122

15

35

130 179 154.5

10

40

322 322 322

5

45

691 691 691

8. If any results look irregular, repeat or share results with friends.

Conclusion.

My graph is a smooth curve. I am confident with my results because my line is on nearly all of the points. My graph shows that the stronger the thio solution the quicker the cross disappears. I know this because when there is 45cm3 of thio solution and only 5 cm3 of water it only takes 65 seconds for the cross to disappear whereas when there is 5cm3 of thio solution and 45cm3 of water it take 691 seconds for the cross to disappear.

Evaluation.

I am confident with my results as I made the experiment a fair test by making sure that the glass wear was washed clean after every experiment. Another reason I am confident is because I done the experiment twice and made an average. If I could do the experiment again then I would maybe repeat it one more time to make my results more dependant.

x

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