Which graph represents the enthalpy change for an acid-base neutralisation reaction?
(A)
(B) - HSC - SSCE Chemistry - Question 10 - 2007 - Paper 1
Question 10
Which graph represents the enthalpy change for an acid-base neutralisation reaction?
(A)
(B)
Worked Solution & Example Answer:Which graph represents the enthalpy change for an acid-base neutralisation reaction?
(A)
(B) - HSC - SSCE Chemistry - Question 10 - 2007 - Paper 1
Step 1
Identify the nature of an acid-base neutralisation reaction
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Answer
An acid-base neutralisation reaction typically involves an exothermic process where an acid reacts with a base to form water and a salt. The overall enthalpy change will be negative, indicating that heat is released.
Step 2
Analyze the graphs provided
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Answer
Graph A shows a profile with a peak, suggesting an endothermic process where energy is absorbed, which does not align with the characteristics of a neutralisation reaction. Graph B, on the other hand, depicts a decrease in enthalpy as the reaction progresses, indicative of an exothermic reaction.
Step 3
Select the correct graph
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Answer
Based on the analysis, the correct answer is Graph (B) as it represents the enthalpy change for an acid-base neutralisation reaction.
