Q: How does concentration affect the rate of a reaction?
Three methods = using a gas syringe, the 'disappearing cross', or a measuring cylinder in water to measure the volume of gas
Example method:
1. put 25cm3 of dilute hydrochloric acid in a conical flask, and connect a bung with a delivery tube to the gas syringe
2. drop a piece of magnesium ribbon into the flask and quickly place the bung over the top, setting a timer to start
3. wait until the fizzing has stopped (reaction is over) to read and record the volume of gas. Repeat using different concentrations of acid, and ensuring that the amount of magnesium ribbon is the same each time (you could use a mass balance to make sure)
Control Variables: temperature, amount of Mg, amount of HCl, etc
Possible Errors: not getting the bung in quickly enough, not starting the timer quickly ...
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