Energy changes
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How do you explain the fact that no matter which Arrhenius acid I react with which Arrhenius base, the enthalpy of reaction is always the same? And what is the enthalpy of reaction?
As long as we are considering a strong acid reacting with a strong base, we
are always dealing with the same reaction, that is:
H+ (aq) + OH– (aq) -> H2O (l)
This is because strong acids and bases are assumed to be completely ionised.
You can find values in Table 5.7 in the Nuffield Book of data. Notice that weak acids (such as CH3CO2H) and weak bases (such as ammonia) have different values, because some energy is needed to bring about ionisation.
Jenkin
Risk assessment
Before attempting any practical work based on the advice and suggestions on this website, you must do the following. Identify any hazards, assess the risks from these hazards, and then decide appropriate control measures to reduce the risks. You must have these approved by those in authority in your school or college laboratory. Do not rely on what is said on this website.
For further guidance see our tutorial on Risk Assessment.
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updated: 22 August 2003
