The Rate Of A Reaction Between Hydrochloric Acid And Sodium Thiosulphate

The Rate Of A Reaction Between Hydrochloric Acid And Sodium Thiosulphate

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The Rate Of A Reaction Between Hydrochloric Acid And Sodium Thiosulphate

Aim: I am going to investigate the effect of changing the
concentration of Sodium Thiosulphate on the rate of the reaction
between Hydrochloric Acid and Sodium Thiosulphate.

Prediction: I predict that as the concentration of the Sodium
Thiosulphate doubles, the rate of the reaction will double. I believe
that when the most concentrated solution is used the reaction would be
at its fastest.

Collision Theory: In a more concentrated solution there are more
particles so collisions occur more frequently. The more often they
collide the faster they react. This means that the rate of reaction
will increase if the concentration of the reactants is increased. As
shown below:

Key=

Sodium Thiosulphate

Hydrochloric Acid

Less concentrated solution More concentrated solution

Independent Variable

The variable that I am going to change is the concentration of Sodium
Thiosulphate.

Dependent Variable

The dependent variable is the time in which the solution becomes
cloudy thus hiding the X.

Controlled Variables

The controlled variables are the temperature, concentration of the
acid, volumes of the Sodium Thiosulphate and the Hydrochloric Acid,
Agitation/stirring.

A factor which may change my results could be how I perceive that the
X is marked.

Summary Method

My investigation is how the concentration of Sodium Thiosulphate will
affect the rate of reaction. I will be using a range of concentrations
from 10cm to 50cm to make it easier to see the difference in a graph.
I then have to record the time taken for the reaction to finish. Once
I have completed the 5 experiments I will use a table to gather my
results and a graph to interpret them. However before I gather my
results I will repeat the experiments for reliability and accuracy.

Apparatus/Equipment

The following apparatus is what I need for this experiment:

* 3 measuring cylinders

* 2 conical flasks

* 1 stopwatch

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* 1 beaker

* a piece of marked paper

* goggles

* gloves

Safety Precautions

Goggles will be worn in order to protect the eyes from acid, and a
pair of gloves will also be worn when handling acids.

Step by step Method

1) As it is the concentration that is changing, the amount of Hcl will
remain the same at 5cm . Measure 50cm of the Sodium Thiosulphate using
the measuring cylinder for the first experiment. Continue the
experiment following the table of concentrations. To make sure that
the measurements are correct read from the bottom of the meniscus as
shown in the diagram:

2) Place a piece of paper marked X on the worktop. Fill the conical
flask with Sodium Thiosulphate then start the timer when adding the
solution of the Hydrochloric Acid. Only when the X has disappeared due
to the precipitate stop the timer.

3) Immediately wash conical flask out to ensure that no residue is
left in the glass that could affect the next experiment.

4) Repeat stages 1to 3 for the different concentrations, using the
range of concentrations on the next page.

5) Repeat the whole experiment for accuracy and reliability.

Rangeof Concentrations

Experiment

Volume of Sodium Thiosulphate (cm )

Volume of Water(cm )

Volume of Hydrochloric Acid (cm )

1

50

0

5

2

40

10

5

3

30

20

5

4

20

30

5

5

10

40

5

My Prediction Graph

The average

time taken

for the X to

be hidden

Concentration of

Sodium Thiosulphate

Rate of

Reaction
Rate of the Production

of Sulphur

The rate of reaction is inversely proportional to the time; this is
shown mathematically as Rate 1

Time

1

Time
Concentration

I will be presenting my graphs once I have completed my task. I will
gather all the information needed and place it in a table like the one
on the previous page; however I will also add the average time.

I will then draw my graphs according to the results.

Tables of Results

Experiment

Volume of Sodium Thiosulphate (cm )

Volume of Water(cm )

Volume of Hydrochloric Acid (cm )

Time of Reaction

(s)

Average

Time(s)

1

50

0

5

2

40

10

5

3

30

20

5

4

20

30

5

5

10

40

5

Experiment

Volume of Sodium Thiosulphate (cm )

Volume of Water(cm )

Concentration %

Conc. g/l

1

50

0

100

40

2

40

10

80

32

3

30

20

60

24

4

20

30

40

16

5

10

40

20

8

Hydrochloric acid and sodium thiosulphateInvestigation into the rate of a reaction between
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