at a certain temperature , K= 9.1 x 10 -4 for thereaction FeSCN 2+ (aq) + <--> F
ID: 676899 • Letter: A
Question
at a certain temperature , K= 9.1 x 10-4 for thereaction FeSCN2+(aq) + <--> Fe3+ (aq) + SCN-(aq) Calculate the concentrations of Fe3+,SCN-, and FeSCN2+ in a solution that isinitially 2.0 M FeSCN2+ at a certain temperature , K= 9.1 x 10-4 for thereaction FeSCN2+(aq) + <--> Fe3+ (aq) + SCN-(aq) Calculate the concentrations of Fe3+,SCN-, and FeSCN2+ in a solution that isinitially 2.0 M FeSCN2+ Calculate the concentrations of Fe3+,SCN-, and FeSCN2+ in a solution that isinitially 2.0 M FeSCN2+Explanation / Answer
We Know that : FeSCN+2aq. --------> Fe+3 + SCN- initial Conc. : 2.0M 0 0 equilib. Conc. -x +x +x K = [ Fe+3 ] [SCN- ] / [FeSCN+2 ] 9.1 x 10-4 = x X x / 2.0 - x Let theVolume of the Reaction Vessel is 1.0 L X2 + 9.1 x 10-4 X - 18.2 x10-4 = 0 By solving the above equation we get : X = 0.0422 The Concnetration of [ Fe+3 ] = [ SCN- ] = 0.0422 M [ FeSCN+2 ] = 2 - 0.0422 = 1. 9578 M initial Conc. : 2.0M 0 0 equilib. Conc. -x +x +x K = [ Fe+3 ] [SCN- ] / [FeSCN+2 ] 9.1 x 10-4 = x X x / 2.0 - x Let theVolume of the Reaction Vessel is 1.0 L X2 + 9.1 x 10-4 X - 18.2 x10-4 = 0 By solving the above equation we get : X = 0.0422 The Concnetration of [ Fe+3 ] = [ SCN- ] = 0.0422 M [ FeSCN+2 ] = 2 - 0.0422 = 1. 9578 MRelated Questions
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