RP3 - Investigating how rate of reaction changes with temperature Flashcards
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
