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CBSE Class 11-science Answered

please tell----chemical equlibrilum
Asked by gober45 | 11 Nov, 2009, 08:09: PM
Expert Answer

Addition of aq. HgCl2 decreases red colour because Hg2+ reacts with SCN ions to form stable complex ion [Hg(SCN)4]2–. Removal of free SCN (aq) shifts the equilibrium from right to left to replenish SCN ions and thus the intensity of red colour decreases.

Oxalic acid (H2C2O4) also decreases the intensity of red colour. This is because it reacts with Fe3+ ions to form the stable complex ion [Fe(C2O4)3]3–, thus decreasing the  concentration of Fe3+ ions.So, to replenish Fe3+ ions the equilibrium shifts from right to left and thus the intensity of red colour decreases.

 

Answered by | 12 Nov, 2009, 11:02: AM
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