Desk Unknows REPORT SHEET EXPERIMENT Colorimetric 22 Determination of an Equilib

Question

Desk Unknows REPORT SHEET EXPERIMENT Colorimetric 22 Determination of an Equilibrium Constant in Aqueous Solution A. Preparation of the Calibration Curve Concentration of FelNOsh in 0.10 M HNO, solution 20AID Concentration of NaSCN in 0.10 M HNO, solution 2 DY 1D2 Flask Number volume ofNaSCN, mle. 1, 00 2.003 ,00 yao ,60 rou Solution Equil. [FeNCS M Percent T Absorbance B. Determination of the Equilibrium Constant 99.658,5 7,2 bsde 13.2 sore Concentration of Fe(NO,h in 0.10 MHNO, solution 2.00x10 Concentration ofNaSCN in 0. 10 M HNO, solution 2.0

Explanation / Answer

(4)

Fe3+(aq) + SCN-(aq) <==> FeSCN2+(aq)

here SCN- is in two form NaNCS,Fe(NCS)3 because of equlibrium of reaction.

in result it should not have same concentration. ( you have missed to mention some experimental data to write in your manual. but it will not same).

(5)

if all the SCN- is in the form of  FeSCN2+, then the equlibrium concentration will be too high.

because Keq=[FeSCN2+]/Fe3+][SCN-]

all SCN- is in form of  FeSCN2+ so [SCN-] will be zero. so Keq will be high.

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