6D Standard Enthalpy Change Of Neutralisation

Question 1

what is Standard Enthalpy Change Of Neutralisation

Answer 1

the enthalpy change measured at 100KPa and a stated temperature, usually 298K, when one mole of water is produced from the neutralization of an acid by an alkali

Question 2

how can we determine the Standard Enthalpy Change Of Neutralisation experimentally

Answer 2

1. wear safety glasses and a lab coat
2. using a pipette fitted with a filler safety add 25cm of 1 mol dm^-1 to an expanded polyester cup
3. measure the temperature of the acid
4. using a pipette with a filler safety add 25 cm of alkali (usually dilute NaOH with a concentration slightly above 1 mol dm^-1 to make sure all the acid is dissolved) into a beaker
5. measure the temperature of the alkali
6. add the alkali to the expanded polyester cup and stir the acid and the alkali together using a thermometer
7. record the maximum temperature reached

Question 3

what are errors that can be spotted in the experiment

Answer 3

1. the temperature given to only 2 significant figures
2. some uncertainties of measurements involving using a thermometer and pipette
3. some of the heat energy formed could be transferred to the thermometer or the polyester cup

Question 4

how can we improve the experiment

Answer 4

look in the slides of Hess’s law