Consider the following acid-neutralization reactions involving the strong base NaOH(aq):
HNO3(aq) + NaOH(aq) → NaNO3(aq) + H2O(l)
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
NH4 +(aq) + NaOH(aq) → NH3(aq) + Na+(aq) + H2O(l)
(a) By using data in Appendix C, calculate ΔH° for each of the reactions. (b) As we saw in Section, nitric acid and hydrochloric acid are strong acids. Write net ionic equations for the neutralization of these acids. (c) Compare the values of ΔH° for the first two reactions. What can you conclude? (d) In the third equation NH4 +(aq) is acting as an acid. Based on the value of ΔH° for this reaction, do you think it is a strong or a weak acid? Explain.
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