... find the end-point of titration, which is then used to : (i) find the molarity of a ammonia, and (ii) the enthalpy change of neutralization. Different combinations of acid and alkali are used and compared. Procedures: Neutralization between aqueous base and acid Method 1: 1) The dry polystyrene cup was taken and two clean burettes were set in stands respectively. 2) Around 1.0M alkali solution and 1.0 M acid were respectively filled the two burettes by using filter funnels. The tips of the burettes were drained and the initial burette readings are recorded. 3) The specified volume of the alkaline solution was drained into the dry polystyrene cup according the following table. Experiment No. 1 2 3 4 5 Vol.of~1.0MNH3(aq)/cm3 25.00 20.00 15.00 10.00 5.00 Vol. of 1.0M HCl(aq)/cm3 5.00 10.00 15.00 20.00 25.00 4) The content in the polystyrene cup was equilibrated for a few minutes and the temperature of the solution was measured and recorded in Table1. 5) The specified amount of acid was quickly drained into the polystyrene cup. 6) The reaction mixture was ...

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