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Determination of Rate of Reaction (3)
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The choice in unit of time
Depends on the rate of reaction
The unit to measure the time for fast reactions
The time is measured in seconds
The unit to measure time for slow reactions
For slow reactions, the time is measured in minutes
The units for rate of reaction that are commonly used (1)
g s–1 or g minute–1
The units for rate of reaction that are commonly used (2)
cm3 s–1 or cm3 minute–1
The units for rate of reaction that are commonly used (3)
mol dm–3 s–1 or mol dm–3 minute–1
Determining rate of reaction
Must be made based on the changes that are observable and can be measured in a certain period of time
Other observable and measurable changes that occur during reactions (1)
- Changes in pressure in reactions involving gases. - The change in pressure is measured using a pressure meter
Other observable and measurable changes that occur during reactions (2)
- Changes in the electrical conductivity of electrolytes in reactions involving mobile ions - An ammeter is used to measure the change in the electrical conductivities in the electrolyte
Other observable and measurable changes that occur during reactions (3)
- Changes in pH values for reactions involving acids or bases in aqueous solutions - A pH meter is used to measure the changes in the pH values with time
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