The Effect of Concentration of Hydrochloric Acid on the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid

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The Effect of Concentration of Hydrochloric Acid on the Rate of Reaction between Sodium Thiosulphate and Hydrochloric Acid

I am going to be investigating the effect of varying the concentration

of Hydrochloric acid on the rate of reaction between Sodium

thiosulphate and Hydrochloric acid.

Chemical reactions can be affected by:

Ÿ Changes in the surface area of solid reactants

Ÿ Changes in concentration

Ÿ Changes in pressure (with gases)

Ÿ Changes in temperature

Ÿ Catalysts

Ÿ Light

But I am changing the concentration, as it is the most practical

experiment to carry out in a school laboratory. I could have changed

the temperature but I have done that experiment before in class.

When carrying out my experiment I need to make sure I follow the

following safety precautions:

Ÿ To keep my lab coat fastened as the laboratory is very crowded.

Ÿ Keep the experiment area clear and tidy to avoid spillages as

hydrochloric acid is corrosive and can damage the bench.

Ÿ Wear safety goggles so that the corrosive acid doesn't get into my

eyes.

Ÿ Tie back my hair so it doesn't get it in the way.

Ÿ I must report any accidents to the teacher immediately, as HCl and

Sodium thiosulphate can be dangerous substances, broken glass can

cause injuries.

Ÿ Wash my hands after practicals involving chemicals, HCl is corrosive

and dangerous if left on skin for too long.There aren't enough fume

cupboards for everyone in the class to use.

I will be using GCSE Chemistry textbooks and class notes for

information for research, which will be secondary quotes.

From experiments I have done in class using Sodium thiosulphate and

Hydrochloric acid. I added 5cm of Hydrochloric acid to 10cm of Sodium

thiosulphate with 40 cm of water. I expect the solution to turn from a

clear solution to a creamy yellow cloudy liquid, which has an

unpleasant smell.

I know that the term concentration is the amount of a particular

substance within a solution or mixture.

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