Reaction Rates

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Recommended: Concentration effect on rate of reaction results

Reaction Rates

The 4 factors that control the rate of a reaction are:

* Concentration

* Temperature

* Surface area (substances size)

* Catalyst

CONCENTRATION.

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.

REACTION: Sodium Thiosulphate + Hydrochloric acid

[IMAGE]Equation: Sodium Thiosulphate + Hydrochloric acid Sodium

Sulphate + Sodium Chloride + water + Sulphur + PPT

This reaction usually produces a yellow precipitate.

EXPERIMENT:

Dose changing the concentration of a liquid affect the reaction rate.

I will test this by putting Sodium Thiosulphate + Hydrochloric acid in

a conical flask which has a piece of paper under it with a black cross

on. As soon as I mix the Sodium Thiosulphate with the Hydrochloric

acid I will time how long it takes for the cross to disappear, the

faster the reaction the quicker the solution will cloud up so the

quicker the cross will disappear. I will then do the same experiment

but add water to the Sodium Thiosulphate to dilute it and time the

experiment again to see if there is any difference.

APPARATUS:

* Piece of paper with cross on it

* Measuring cylinder

* Conical flask

* Stop watch

* Thermometer

* Stirrer

METHOD:

1) Measure out 10cm3 hydrochloric acid in a measuring cylinder

2) Pour measured out hydrochloric acid in conical flask

3) Measure out sodium thiosulphate in a measuring cylinder from 30cm3

and no water to 5 cm3 of sodium thiosulphate and 25cm3 of water)

4) Pour in to conical flask so mixing with the Hydrochloric acid and

start top watch

5) Time how long it takes for the cross to disappear.

CONSTANTS: apparatus amount of hydrochloric acid

VARIABLES: amount of Sodium Thiosulphate and water

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