Rate of reaction can be found in different ways:
1. Measuring the amount of reactants used
-If one of the products is a gas, measure the mass (in grams) of the reaction mixture before and after the reaction takes place and the time it takes for the reaction to happen.
-The mass of the mixture will decrease
-As the reaction takes place the reactant is used up, so the amount of reactant remaining decreases
-The concentration of the reactant is calculated as the amount divided by the volume of the reaction mixture
2. Measuring the amount of products formed
-If one of the products is a gas, measure the total volume of gas produced in cubic centimetres with a gas syringe and the time it takes for the reaction to happen
3. Measuring the time it takes for a reaction mixture to become opaque or change colour
-Time how long it takes for the mixture to change colour
-Rate of reaction = 1 ./. time taken for solution to change colour
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