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HgO is analysed by reaction with iodide ...

HgO is analysed by reaction with iodide and them titrating with an acid. The equivalent mass of `HgO` is `H_(2)O+HgO+4I^(-)rarrHgI_(4)^(-2)+2OH^(-)`

A

molarity of `Na_(2)CO_(3)=20v_(1)`

B

M/2

C

M/4

D

M/3

Text Solution

Verified by Experts

The correct Answer is:
B
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Acic base + Redox titration 1^(st) titration : M/10 reacts with oxalic acid as well as H_(2)SO_4 according to equation H_(2)C_(2)O_4 + NaOH rarrNa_(2)C_(2)O_4 + H_(2)O, H_(2)SO_(4)) + NaOH rarr Na_(2)SO_(4) + H_(2)O 2^(nd) titration : The mixture solution is titrated with M/10KMnO_4 solution which will reacts with oxalic acid (redox titration) in the presence of H_(2)SO_(4) H_(2)C_(2)O_(4) + underset(("Purple"))(KMnO_4)+H_(2)SO_(4) rarr K_(2)SO_(4) +underset(("Colourless"))( MnSO_4)+H_2O+CO_2 The reactionof oxalic acid with KMnO_4 is very slow therefore the oxalic acid solution is heated to 60-70^@C initially. Once the reation has started, its rate automatically increases. MnO_4^(-) acts as an oxidising agent. MnO_(4)^(-)overset(H^(+))rarrunderset("colourless")(Mn^(++),MnO_(4)^(--) ,MnO_(4) underset(H_2O)rarroverset("Brown ppt")(MnO_2) If 1.34 gm Na_(2)C_2O_4 dissolve in 50 ml of water this solution is titrated with KMnO_4 The volume of KMnO_4 used is

Acic base + Redox titration 1^(st) titration : M/10 reacts with oxalic acid as well as H_(2)SO_4 according to equation H_(2)C_(2)O_4 + NaOH rarrNa_(2)C_(2)O_4 + H_(2)O, H_(2)SO_(4) + NaOH rarr Na_(2)SO_(4) + H_(2)O 2^(nd) titration : The mixture solution is titrated with M/10KMnO_4 solution which will reacts with oxalic acid (redox titration) in the presence of H_(2)SO_(4) H_(2)C_(2)O_(4) + underset(("Purple"))(KMnO_4)+H_(2)SO_(4) rarr K_(2)SO_(4) +underset(("Colourless"))( MnSO_4)+H_2O+CO_2 The reactionof oxalic acid with KMnO_4 is very slow therefore the oxalic acid solution is heated to 60-70^@C initially. Once the reation has started, its rate automatically increases. MnO_4^(-) acts as an oxidising agent. MnO_(4)^(-)overset(H^(+))rarrunderset("colourless")(Mn^(++),MnO_(4)^(--) ,MnO_(4) underset(H_2O)rarroverset("Brown ppt")(MnO_2) In the permanganate titration, the solution of reductant is always made acidic by adding H_2SO_4 rather than HCl or HNO_3 because