E) What would be the reaction (NIE) and Ecell at pH 7.5 ..... ? Monday April 17,

Question

E) What would be the reaction (NIE) and Ecell at pH 7.5 ..... ?

Monday April 17, 2017, by 5 pm in my mailbox, 106 Berliner Hall. You MUST sign the honesty pleage (25 points) 1. groundwater is a serious concern since it is so toxic. Let's learn a bit about the redox Arsenic in chemistry of arsenic. arsenic-laced ground is to d, one proposed low-cost method to remediate water in H3Aso, is the major poor countries aerate the water and run it through a column of iron filings Assuming that form present, determine the Ecem 1x106 M, Fe x103 M, and pH 6.00 when [H3Aso3 Is this a favorable reaction? ETA (V) Reaction equation Oxidation Reduction 3 feds NIE 0.0592 loge the transferred X (O 0.4

Explanation / Answer

As per Nernst equation,

Ecell = E0cell - (0.0592/n)*log{[Fe2+]3/[H+]6*[H3AsO3]2}

or, Ecell = 0.68 - (0.0592/6)*log{(1*10-3)3/(3.16*10-8)6*(1*10-6)2} = 0.00987*log(3.16*1050) = 0.5 V

Since, Ecell > 0 , therefore the reaction is favaourable.

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