Mandatory Student Experiment No. 14B
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What is studied in this experiment?
The effect of temperature on reaction rate using sodium thiosulfate solution and hydrochloric acid
Describe the 9 steps to this experiment
• A conical flask is placed on a sheet of white paper marked with a cross • 100 cm cubed of 0.05 cm cubed of sodium thiosulfate solution is added to the conical flask at room temperature • 5 cm cubed of 3 M HCL is added to sodium thiosulfate solution • The conical flask is swirled and a stop clock is started • The exact temperature of the contents of the flask is recorded • The time in seconds taken for the cross to disappear is recorded • The rate as the inverse of the time (1/time) is calculated • The equipment is rinsed • The experiment is repeated at different temperatures i.e. the sodium thiosulfate is heated to 30, 40, 50 and 60 degrees Celsius using a hot plate before adding the HCL
What is the conical flask placed on in this experiment?
A white sheet marked with a cross
How much 0.05 M sodium thiosulfate solution is added to the conical flask?
100 cm cubed
What M of sodium thiosulfate solution is used?
0.05 M
What M of HCL is used?
3 M
How much 3 M HCL is added to the sodium thiosulfate solution?
5 cm cubed
What is done once the HCL has been added to the sodium thiosulfate solution?
The conical flask is swirled The flask is placed on the sheet marked with a cross A stop clock is started
When is the exact temperature recorded?
After the acid has been added to the sodium thiosulfate solution
What is recorded once the sodium thiosulfate solution has been combined with the HCL?
The exact temperature is recorded
When is the reaction said to be completed?
When the cross can no longer be seen through the solution
When is the stop clock stopped?
When the solution has become milky/ colour change form colourless to creamy yellow
What is recorded after the reaction has stopped?
The rate of the reaction as an inverse of time (1/time)
What is done before the experiment is repeated?
The equipment is rinsed
At what temperatures is the experiment repeated?
30, 40, 50 and 60 degrees Celsius
When a graph of the rate of the reaction is plotted against the temperature, what type of graph is observed?
Unlike the graph used to plot the rate of reaction against concentration of sodium thiosulfate solution in M/L the rate of reaction is not directly proportional to the temperature and it is therefore not a straight line graph