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06/10/2020 11:13 am
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The heat of neutralization of a strong base and a strong acid is 57 kJ. The heat released when 0.5 moles of HNO3 solution is added to 0.20 moles of NaOH solution, is
(a) 11.4 kJ
(b) 34.7 kJ
(c) 23.5 kJ
(d) 58.8 kJ
1 Answer
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06/10/2020 11:19 am
(a) 11.4 kJ
Explanation:
The chemical reaction between strong base and strong acid is a neutralisation reaction between H+ ion and OH- ion.
H+ + OH- → H2O + Heat
One mole of H+ and one mole of OH- give 57 kJ. When 0.5 moles of H+ (from HNO3) reacts with 0.2 mole of OH- (from NaOH), 0.2 mole of H+ is neutralised by 0.2 mole of OH- and 0.3 mole of H+ remains unreacted.
H+ + OH- → H2O
Heat evolved will be = (57 x 0.2)/1
= 11.4 kJ