Solution



Back 		Heat of neutralisation is the heat change when 1 mole of from an acid is neutralised by 1 mole of

i) A plastic container was used to reduce heat loss as plastic is a good insulator.

ii) (a) Take temperature of starting solutions just before mixing. If temperatures are different use the average value.
(b) Use a sensitive thermometer
(c) Stir mixture well before taking final temperature.

iii) = 0.4 4.2 5.5 = 9.24 kJ

Mass = Density Volume
Mass = 1 400 = 400 g = 0.4 kg

Moles of acid = Volume (in litres) Molarity
= 0.2 0.4 = 0.08 mol

is a dibasic acid (i.e. two replacable hydrogens)
0.08 mol 0.16 mol
0.16 mol produces 9.24 kJ of heat
Heat produced for 1 mol = 57.75 kJ
Heat of neutralisation = -57.75 kJ