rate experiments
- Created by: tia5sos
- Created on: 18-11-20 20:27
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- rate experiments
- reaction of hydrochloric acid and marble chips
- you can use this experiment to find out how surface area affects the reaction rate
- 1. set up the apparatus as shown in the diagram
- 2. measure the volume of gas produced using a gas syringe. Take readings at regular time intervals and record your results in a table.
- 3. you can plot a graph of your results - time goes on the x - axis and volume goes on the y axis
- 4. repeat the experiment with exactly the same volume and concentration of acid, and exactly the same mass of marble chips, but with the marbles chips more crunched up
- 5. then repeat with the same mass of powdered chalk
- finer particles of solids mean a higher rate
- 1. using finer particles means that the marble has a larger surface area
- 2. lines 1 - 3 on the graph on the left show that the finer particles are (and the greater the surface area of the solid reactants), the faster the reaction goes
- 3. line 4 shows the reaction if a greater mass of small marble chips is added. The extra surface area gives a faster reaction and there is also more gas evolved overall.
- reaction of magnesium with dilute HCl
- 1. this reaction is good for measuring the effects of changing the concentration on reaction rate
- 2. the reaction gives off hydrogen gas, so you can measure the loss of mass as the gas is formed using a mass balance.
- more concentrated solutions mean a higher rate
- 1. during the experiment, take readings of the mass of the flask and its contents at regular time intervals. Put the results in a table and work out the loss in mass for each reading
- 2. you van plot a graph of your results with time on the x - axis and loss in mass on the y axis
- 3. repeat the experiment with exactly the same mass and surface area of magnesium and exactly the same volume pf acid, but using different concentrations of acid
- 4. lines 1 - 3 on the graph show that a higher concentration gives a faster reaction, with the reaction finishing sooner.
- reaction of hydrochloric acid and marble chips
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