RP3 - Investigating how rate of reaction changes with temperature
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What 2 ways can the rate of reaction be determined?
Loss of a reactant overtime The gain of a product overtime
What 2 ways can rate of reaction be measured?
Initial rate method Continuous monitoring method
What is the equation for the reaction of sodium thiosulfate with hydrochloric acid?
Na2S2O3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + SO2(g) + S(s)
How can you investigate how temp alters reaction rate using sodium thiosulfate and HCl?
Place conical flask on piece of white paper with a black X underneath it Add sodium thiosulfate to conical flask Add HCl and start stopwatch When cloudy S precipitate forms and X is no longer visible, stop the stopwatch. Repeat experiment 5 times with different temperatures and compare the results
What are some issues with the practical method?
Subjective as judged by eye, unreliable Delayed reaction time with watch Reaction may be too slow at low temp May not be enough precipitate for cross to disappear
How can you plot the data?
Plot a graph of concentration of sulfur against time
How can the mixture be kept at a constant temperature?
Use of a water bath