The accepted Delta H_neuten of hydrobromic acid (HBr) reacting with NaOH solutio

Question

The accepted Delta H_neuten of hydrobromic acid (HBr) reacting with NaOH solution and of HNO_3 reacting with potassium hydroxide (KOH) solution are identical. Write net ionic equations to show what aqueous HBr and HNO_3 have in common. State what aqueous NaOH and KOH have in common. Explain why you would expect that Delta H_neuten for HBr reacting with NaOH solution and Delta H_neuten for HNO_3 reacting with KOH solution would be identical. Write appropriate equations to support this explanation.

Explanation / Answer

Q3.

a)

Write net ionic euqations:

HBr(aq) + NaOH(aq) = H2O(l) + NaBr(aq)

ionic

H+(aq) + Br-(aq) + Na+(aq) + OH- (aq) = H2O(l) + Na+(aq) + Br-(aq)

net ionic (cancel spectator ions)

H+(aq) OH- (aq) = H2O(l)

for

HNO3(aq) + KOH(aq) = H2O(l) + KNO3(aq)

complete ionic

H+(aq) + NO3-(aq) + K+(aq) + OH-(aq) = H2O(l) + K+(aq) + NO3-(aq)

net ionic

H+(aq) + OH-(aq) = H2O(l)

Clearly, they both acids will donate 100% their H+ to solution, which will reac twith the base

The anions remains in solution, so it acutally does not react

Q2.

clearly, they are both strong bases, they donate 100% of their OH- ions to solution

the cations remain in solution and will not react

Q3.

We will expect pretty similar HRxn of neutralizations to be similar

since the net ionic equation is EXACTLY the same

that is, the same reaction H+ and OH- is occuring in both cases

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