1.

if the heat of neutralisation for a strong acid- base reaction is -57.1 kJ, would be the heat released when 350 cm^(3)of 0.20 M ofa dibasic strong acid is mixed with 650 cm^(3) of 0.10 M monoacidic base ?

Answer»

57.1 kJ
3.71 kJ
`-57.1 kJ`
0.317 kJ

Solution :millimoles of dibasic strong ACID
` M XX V=0.20xx350=70 MMOL`
Amount of `H^(+)` IONS in the acid = `2xx70=140 mmol`
SIMILARLY, amount of `OH^(-)`ions in the acid `0.10xx650xx =65 mmol`
[ Here, `OH^(-)` is the limiting reactant]
`65 xx10^(-3)` mole of `OH^(-)` ions will produce
`=57.1xx65xx10^(-3)=3.71kJ`


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