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Calculate the potential of the following...

Calculate the potential of the following cell reaction at 298K:
`Sn^(4+)(1.50M)+Zn(s)rarrSn^(2+)(0.5M)+zn^(2+)(2.0M)`
The standard potential of the cell is 0.89V, will the potential of the cell will increase or decrease if the concentration of `Sn^(2+)` is increased in the cell?

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