Stage 2 Chemistry: Design Investigation: Rates of Reactions (Independent…
Stage 2 Chemistry: Design Investigation: Rates of Reactions
The time taken until the "x" disappears from view (obscured)
Temperature interval of sodium thiosulphate. room temp., 30, 40, 50, 60,
Concentrations used are (0.5M, 0.4M, 0.3M, 0.2M, 0.1M)
Concentration of sodium thiosulphate, (0.5M initially)
Temperature of the room
Affects the rate of the reaction
Volume of sodium thiosulphate (kept at 10 mL)
Concentration of the HCl (2M or 1M more realistically)
Volume of the HCl (constant as 10 mL)
Limitations of Design
Temperature using the provided equipment is hard to maintain and can change during the course of a reaction, affecting the results
Dilutions require time to prepare, which means less time for the experiment
The SO2 gas produced is quite toxic and causes irritation, low volumes will have to be used
If the temperature of sodium thiosulphate is increased, then the rate of reaction will also increase
As the concentration of sodium thiosulphate increases, then the rate of the reaction will increase
2M HCl is available
Na2S203 + 2HCl -> S(s) + 2NaCl + SO2(g) + H2O(l)
How do I know when the reaction is complete?
Does sodium thiosulphate have health risks in high concentrations?
What is a lethal dose of "cyanide"?