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At 57.0 ∘C , what is the maximum value of Q needed to produce a non-negative...

At 57.0 ∘C , what is the maximum value of Q needed to produce a non-negative E value for the reaction

SO42−(aq)+4H+(aq)+2Br−(aq)⇌Br2(aq)+SO2(g)+2H2O(l)

In other words, what is Q when E=0 at this temperature?

Express your answer numerically using two significant figures.
2)Calculate the pK=−log(K) at 25∘C for each of the following reactions (K is equilibrium constant).
Pb(s)+2H+(aq)→Pb2+(aq)+H2(g)
Cl2(g)+Sn2+(aq)→Sn4+(aq)+2Cl

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