Required practical 3 Flashcards
1
Q
Step 1
A
Use a water bath to warm separate samples of Na2S2O3 and HCl to 25,35,45, and 55 degrees
2
Q
Why should you not heat samples above 55 degrees
A
The reaction produces SO2 which can be toxic - heating beyond 55 degrees produces too much SO2
3
Q
Step 2
A
Place conical flask on white tile with black cross
4
Q
Step 3
A
Add first sample of HCl to first sample of Na2S2O3 and start timer
5
Q
Step 4
A
Record how long it takes for the cross to disappear
6
Q
What causes the cross to disappear
A
The production of Sulfur (s)
7
Q
Step 5
A
Repeat the experiment at the remaining temperatures
8
Q
Step 6
A
Calculate 1/t for each of the temperatures
9
Q
What is 1/t used as
A
Surrogate for rate
10
Q
Analysis
A
Plot graph of 1/t (on y axis) and temperature (on x axis)
