Paper 3: Required practical 7 - Measuring rate of reaction
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What is the initial rates method?
Measuring the initial rate of reaction for multiple different concentrations to observe how rate of reaction varies
What are the issues with the iodine clock reaction?
• Some low I- concentrations may take too long to react • Deleayed stopwatch reactions • Concentrations may not be exact due to measuring apparatus
What is a continuous monitoring method?
This involves measuring the change in concentration of a reactant or product over time as the reaction progresses
How would you analyse the data from a continuous montioring experiment?
• Plot a graph of volume of hydrogen gas produced (y) against time for each concentration of HCl - draw a lob • Draw a tangent at t=0s for each line • Calc gradient of each tangent • Compare the calculated rate values
What are some issues with this experiment?
• Some gas may escape before the bung is added • Mg strips may be of different mass and surface area
How do you prevent gas escaping?
Place the solid reactant upright inside a sample tube in the conical flask, tipping the tube over by moving the conical flask around to start the reaction