An investigation into how concentration affects the rate of reaction between Sodium Thiosulphate and Hydrochloric acid

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An investigation into how concentration affects the rate of reaction between Sodium Thiosulphate and Hydrochloric acid

In this experiment I am going to find out how the rate of reaction between sodium Thiosulphate and hydrochloric acid is affected by changing the concentration of Hydrochloric acid..

We will be placing the mixture of both liquids on a paper with a black cross-drawn on, once the mixture begins to turn cloudy and the cross is no longer able to be seen, the reaction would have taken place. We will be measuring the time taken for this to happen, and therefore measure the rate of reaction. We will be doing this several times, changing the concentration of Hydrochloric acid, and completing the experiment of each level of concentration three times in order to gain an average result for each.

The input variable we will be changing is the concentration of Hydrochloric acid. We are going to vary this factor to see what concentration of HCL is the fastest to react with Sodium Thiosulphate, and to measure the rate of reaction.

The variable we will be measuring to find out how the effect the concentration has will be the time taken for the reaction to complete.

Plan

Below is a list of apparatus I will need to complete the experiment .

· Sodium Thiosulphate (50 cm3 each time)

· Hydrochloric acid (a total of 100 cm3 but varying in concentration each time)

· Conical flask.

· Distilled water

· Stop watch

· Paper with black cross on it

· Small measuring cylinder

· Large measuring cylinder

I will be using five different concentrations of Hydrochloric acid.
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Below is a table to show how to make a particular concentration of hydrochloric acid.

0.2

20

80

0.4

40

60

0.6

60

40

0.8

80

20

Method

Firstly we measured out our first concentration of hydrochloric acid (0.2) using 20 cm3 of Hydrochloric acid and 80cm3 of distilled water. We then poured 50 cm3 of Sodium Thiosulphate into a conical flask and placed it over the piece of paper with a black cross drawn on. We then poured 5 cm3 of the 0.2 ...

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