Write the two acid-base neutralization reactions and reaction 1. ( two neutraliz

Question

Write the two acid-base neutralization reactions and reaction 1. (two neutralization reactions: HCl/NaOH reaction and NaHCO3/NaOH reaction)

(reaction 1: HCO3-(aq) + H2O(l) <------> H30+(aq) + CO3^2-(aq)

Use Hess's law to show the relationship among DeltaH for reaction 1 and the DeltaH values for the two neutralization reactrions determined in part 1. (DeltaH values from part 1 for HCl/NaOH: -44 and -41kj. DeltaH values from part 1 for NaHCO3/NaOH: -25 and -28kj)

Please help, I have no idea what im doing :(

Explanation / Answer

H+ + OH- ---> H2O Hrxn = -44

HCO3- + OH- --> H2O + CO3-2 HRxn = -25

we need

HCO3- +H2O --> H+ + CO3-2

clearly, we need to add the ivnerted reaction of (1) to (2)

invert (1)

H2O--->H+ + OH- Hrxn = +44

HCO3- + OH- --> H2O + CO3-2 HRxn = -25

add all

H2O + HCO3- + OH- --> H2O + CO3-2 + H+ + OH- HRxn = 44-25

cancel common terms

HCO3- +--> CO3-2 + H+ HRxn = 19

which is what we watned (or add H2O in both sides:)

HCO3- + H2O --> CO3-2 + H3O+ HRxn = 19

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