Clock reactions Flashcards
1
Q
What do you measure in a clock reaction?
A
How the time taken for a set amount of product to form changes as you vary the concentration of one of the reactants
2
Q
What assumptions do you need to make when you do a clock reaction?
A
- The temperature remains constant
- The concentration of each reactant doesn’t change significantly over the period of time of your clock reaction
- When the endpoint is seen, the reaction has not proceeded too far
3
Q
What is the ionic equation for the iodine clock reaction?
A
H2O2 + 2I- + 2H+ -> 2H2O + I2
4
Q
What indicator is used in the iodine clock reaction?
A
Starch
5
Q
What colour change is seen with the starch if the iodine is present?
A
Turns blue-black
6
Q
What concentrations do you change in the iodine clock reaction?
A
Iodine
hydrogen peroxide
