An Investigation on the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid

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An Investigation on the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid

Chemical Background

When sodium thiosulphate is mixed with dilute hydrochloric acid it makes a

cloudy liquid of sodium chloride, water, sulphur (this makes the liquid cloudy),

and it gives of the gas sulphur dioxide. A precipitate of sulphur is made.

Sodium + hydrochloric = sodium + water + sulphur + sulphur

Thiosulphate acid chloride dioxide

The Chemical reaction happens as the particles collide because they have energy.

As they collide they make, sodium chloride, water, sulphur, and sulphur dioxide.

A reaction happens quicker when there are more thiosulphate particles to

hydrochloric acid particles.

Aim

The aim is to find out how does the rate of reaction between sodium thiosulphate

and hydrochloric acid change as the concentration of the sodium thiosulphate

changes?

Prediction

I predict that the greater the ratio of sodium thiosulphate to water the quicker

the solution will cloud over as the participate of sulphur forms. To increase

the rate of reaction you need to increase the number of collisions between the

reacting particles. In this case the more thiosulphate there is to collide with

the hydrochloric acid the quicker a reaction will happen. When the thiosulphate

is diluted by distilled water there are less particles to collide with the

hydrochloric acid there for the rate of reaction is slower. When I carried out

the preliminary experiment using 50cm3 of thiosulphate with 0cm3 of distilled

water and 5cm3 of Hydrochloric acid the reaction happened in 25seconds when

using the 2moler acid, 31seconds when using the 1moler acid and 43 seconds when

using the 0.5moler acid. The rate of reaction got slower as there were less

collision between the hydrochloric acid and thiosulphate because the

concentration of the acid got less. When we changed the concentration of the

sodium thiosulphate to 40cm3 to 10cm3 of water then add the same amount of

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