How does the concentration affect the rate of reaction?

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Coursework: Rates of Reactions

How does the concentration affect the rate of reaction?

Introduction

In my experiment I will be investigating the effect of varying the concentration of Sodium Thiosulphate when reacting with Hydrochloric Acid. I will be using the following reaction.

                          +                                                +  Sulphur   + Water

The theory behind this experiment is that when the concentration increases the rate of the reaction increases the rate of molecular collisions.

How to measure the rate of reactions

I can measure this reaction by putting a piece of paper with a cross drawn on it underneath a beaker with the chemicals in and use a stopwatch to see how long it takes the solution to become to cloudy to be able to see the cross.

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Equipment Needed

Measuring Cylinder: 10cm3

                          50cm3

                          100cm3

Conical Flask 250cm3

Beakers

Safety Goggles

Stop Clock

Step-by-Step Guide

  1. Measure 50cm3 of Sodium Thiosulphate into a conical flask.
  2. Place the flask onto a cross drawn onto a piece of paper.
  3. Add 5cm3 of Hydrochloric Acid to the flask using a small measuring cylinder and stir the solution and immediately start the clock when acid is added.
  4. Look through the solution until the cross cannot be seen and stop the clock, write down results onto a table.
  5. ...

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