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) +

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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

Page 2

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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