Question

Questions 15 mne neutralization reaction between HCl and NaOH and between HNO, and NaOH exothermic or endothermic? How is this reflected by the sign of AHeutralization? 2. Hydrochloric and nitric acids are strong acids. Write a balanced equation (including states of matter) to show the ionization of: HCl in aqueous solution. HNO, in aqueous solution. 3. Sodium hydroxide is a strong base. Write a balanced equation (including states of matter) to show the dissociation of solid NaOH in aqueous solution. 4. Write balanced total ionic and net ionic equations, with proper charges and states, for the neutralization of: • Aqueous HCl with aqueous NaOH. • Aqueous HNO, with aqueous NaOH. 5. The value for the heat of neutralization when HCl reacts with NaOH should be the same as that obtained when HNO, reacts with NaOH. Explain why these values should be identical even though different acids reacted.

Answer 1

1. Neutralisation is always an exothermic process .

An exothermic process is that in which heat is released from the system to surroundings , while an endothermic reaction is that Heat is absorbed by the system .

So neutralisation reaction of HCl - NaOH and HNO3-NaOH , both are exothermic .

HCl(aq) + NaOH(aq) >>>>> NaCl(aq) + H2O(l)

HNO3(aq) + NaOH(aq) >>>>> NaNO3(aq) + H2O(l)

∆H = enthalpy of products - enthalpy of reactants

As energy is released during the process then enthalpy of products is less than reactants and hence

∆Hneutralisation = -ve sign.

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