The Reaction Between Sodium Thiosulphate and Hydrochloric Acid

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The Reaction Between Sodium Thiosulphate and Hydrochloric Acid

The Effect on the concentration on the reaction between Sodium Thiosulphate and Hydrochloric acid

Our aim in this investigation is to find out how the concentration of Sodium Thiosulphate affects the rate at which it reacts with Hydrochloric acid. The equation for this reaction is

Na2S2O3(aq) + 2HCl(aq) = 2NaCl(aq) + H2O(l) + SO2(g) + S(s)

Ionic equation:

2H+(aq) + S2O3²- (aq) = H2O(l) + SO2(g) + S(s)

The rate of a reaction is the rate of loss of a reactant or rate of formation or a product during a chemical reaction. There are five factors that may affect the rate of reaction, according to the collision theory of
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To do our experiment we will use:

Ÿ Sodium Thiosulphate

Ÿ Water

Ÿ Hydrochloric acid

Ÿ A beaker

Ÿ A stop-clock

Ÿ A measuring cylinder

Ÿ A syringe

Ÿ A black cross

Ÿ Goggles

We will first check the temperature of the room by checking the electronic thermometer on the wall. We are assuming that this is accurate. We have no way of controlling the room temperature so when evaluating will take this in to consideration. We could use ice to control the temperature but this would be too time consuming and could be inaccurate. Once the temperature has been recorded, we will get all the equipment needed ready to use. This will make all the tests fair

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and will make the experiment safer as we will not have to search for pieces of equipment during the experiment. Next, we will measure out the first volume of Sodium Thiosulphate that we need for the first experiment, this is 50cm3. We will do this by using a measuring cylinder and putting the cylinder on the work surface as we are checking to make sure we have the right amount. Once we are sure that the amount we have is accurate we will then put that in to a beaker on top of the cross. We will check the cross to make sure that it has nothing on it that will

affect the experiment. The beaker will also be checked,

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