Question

Write equilibrium constant expression for the following:
$left parenthesis straight i right parenthesis space Fe to the power of 3 plus end exponent left parenthesis aq right parenthesis space plus space SCN to the power of minus left parenthesis aq right parenthesis space space rightwards harpoon over leftwards harpoon space space FeSCN to the power of 2 plus end exponent left parenthesis aq right parenthesis left parenthesis ii right parenthesis space 3 Fe left parenthesis straight s right parenthesis space plus space 4 straight H subscript 2 straight O left parenthesis straight g right parenthesis space space space rightwards harpoon over leftwards harpoon space space Fe subscript 3 straight O subscript 4 left parenthesis straight s right parenthesis space plus space 4 straight H subscript 2 left parenthesis straight g right parenthesis$

Solution

space space left parenthesis straight i right parenthesis space straight K subscript straight c space equals space fraction numerator open square brackets FeSCN to the power of 2 plus end exponent left parenthesis aq right parenthesis close square brackets over denominator open square brackets Fe to the power of 3 plus end exponent aq close square brackets space open square brackets SCN to the power of minus left parenthesis aq right parenthesis close square brackets end fraction space space left parenthesis ii right parenthesis space straight K subscript straight c space equals space fraction numerator left square bracket Fe subscript 3 straight O subscript 4 space left parenthesis straight s right parenthesis right square bracket left square bracket straight H subscript 2 left parenthesis straight g right parenthesis right square bracket to the power of 4 space over denominator left square bracket Fe left parenthesis straight s right parenthesis right square bracket cubed left square bracket straight H subscript 2 straight O left parenthesis straight g right parenthesis right square bracket to the power of 4 end fraction

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