Unformatted text preview: ammonia molecules escape into the gas phase. Draw a diagram of the system and label it with the same level of detail that we used in class. Then set up a system of equations that you could use to solve for the equilibrium pH of the water. Also name the key chemistry concept that governs each equation . Note: you do NOT need to solve this system of equations! Potentially useful DATA: Dissociation reaction: NH 4 + ⇔ NH 3 + H + Acid dissociation constant for NH 4 + pK A = 9.23 Henry’s constant for NH 3 at 20 o C K H = 62 M atm-1 Water dissociation : K w = H + [ ] OH − [ ] = 10 − 14 Acid/Base Equilibrium : K a = H + [ ] NH 3 [ ] NH 4 + [ ] = 10 − 9.23 Mass Balance : Cl − [ ] = NH 4 + [ ] + NH 3(aq) [ ] + NH 3(g) [ ] Electroneutrality : NH 4 + [ ] + H + [ ] − Cl − [ ] − OH − [ ] = Henry ʼ s constant : K H = NH 3 [ ] p NH 3...
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- Spring '10
- Mole, NH, potentially useful data