R2.2 Measuring reaction rates

How can rate of reaction be measured?

1. Mass

2. Gas production

1. Colorimetry

2. Conductivity

How does a colorimeter measure concentration

More concentrated☕→darker→blocks light→lower light transmission

Less concentrated🍵→clearer→allows more light transmission

What is a limitation of measuring rate of change with mass?

Gas must be dense enough or mass won’t be measurable

How are reactions stopped before performing titrations to find conc?

Quenching ‘freezes’ the reaction at a specific point in time

How is rate of reaction measured using conductivity?

Ions may be used up or formed during a reaction, changing conductivity

Conductivity probe used at regular time intervals

Rate of change using colorimeter graph

Rate of changing using change in mass

Rate of changing using gas volume