Rates Of Reaction
This practical lesson covers:
- How concentration affects the rate of reaction and the volume of gas produced
Investigating rates of reaction
Aim
To investigate the relationship between concentration and rate of reaction.
Background information
The rate of a chemical reaction depends on several factors, including temperature, reactant concentrations (or pressures), surface area of solid reactants, and the presence or absence of a catalyst. One method to measure the rate of a reaction is by determining the rate at which a product, such as a gas, is formed. In this practical, you will investigate how the concentration of hydrochloric acid affects the rate of reaction when added to magnesium. You will measure the rate of reaction by observing the rate at which hydrogen gas is produced.
What is the purpose of the bung and delivery tube in Method 1?
to collect the hydrogen gas
to measure the volume of hydrogen gas
to measure the temperature of the reaction
to prevent the escape of hydrogen gas
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What is the purpose of the black paper cross in Method 2?
to collect the sodium thiosulfate
to provide a reference point for visibility
to measure the temperature of the reaction
to measure the volume of sodium thiosulfate
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What is the dependent variable in the investigation?
rate of reaction
volume of hydrogen gas produced
concentration of the hydrochloric acid
temperature of the reaction
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What is the independent variable in the investigation?
volume of hydrogen gas produced
temperature of the reaction
rate of reaction
concentration of the hydrochloric acid
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What is the control variable in the investigation?
rate of reaction
concentration of the hydrochloric acid
volume of hydrogen gas produced
temperature of the reaction
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