Measuring reaction rates 114-115

Question 1

For reactions involving acids or bases, what can we measure and what do we use to measure it?

Answer 1

• Ph changes by carrying out titrations
• pH changes by using a pH meter.

Question 2

For reactions that produce gases, what can we measure and using what?

Answer 2

• The change in volume or pressure
• The loss in mass of reactants

Question 3

For reactions that produce visual changes, we can observe what?

Answer 3

• The formation of a precipitate.
• A colour change.

Question 4

What is a colorimeter and how does it work?

Answer 4

A colorimeter measures the intensity of different colours in a liquid - the colorimeter passes filtered light through the sample and the intensity of the colour is recorded.