Question

Decide whether the species on the left or those on the right are favored by the...

Decide whether the species on the left or those on the right are favored by the reaction. Circle left or right.

a) NH4+ + H2PO4- <---> NH3 + H3PO4    Left/Right

b) HCN + HS- <---> CN- + H2S Left/Right

c) HCO3- + OH- <---> CO32- + H2O Left/Right

d) Al(H2O)63+ + OH- <---> Al(H2O)5OH2+ + H2O Left/Right

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Homework Answers

Answer #1

Reaction will proceed towards side where weak acid is present ( i.e acid with high pka)

a) Reaction favours left .  

This is because strong acid H3PO4 will protonate base NH3 easily compared to weak acid NH4+ protonating H2PO4-

b) Reaction is favoured towards left since H2S is stronger acid and can protonate CN- compared to weaker acid HCN which protonates HS-

c) reaction is favoured right.

This is because HCO3- is stronger acid to protonate OH- compared to weak acid H2O whcih protonates CO3^2-

d) reaction is right favoured.

Al(H2O)6^3+ is strong acid compared to H2O . Hence AL(H2O)6^3+ protonates OH- readily.

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