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Assay of Mohr`s Salt( Ferrous Ammonium Sulphate)

AIM : To perform the assay of the given sample of mohr`ssalt .

APPARATS :(!). Mohr`s salt.("). #.! $ %Mno&

('). il."so&(&). #.! $ o*ali+ a+i, solution

(For stan,ar,isation of %Mno&solution ). Prepare, -y,issolving '# mg of o*ali+ a+i, in !## ml of ,istille, /ater.

PRI$0IP12 :Titrations /hi+h involve the pro+ess of

o*a,ition an, re,u+tion are +alle, re,o* titrations. The assayof Mohr`s salt is an e*ample of re,o* titration

( permanganametry).In the presen+e of ,il."so&3%Mno&o*i,isesFeso&of Mohr`s salt to ferri+ sulphate in +ol,+on,ition .The follo/ing rea+tions ta4es /hen mohr`s salt is

-titrate, /ith %Mno&in the presen+e of ,il."so&

R2A0TI5$S :

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In this titration %Mno&3 a+ts as a self6in,i+ator.

PR502R2: (a).For Stn,ar,isation of %Mno& Solution :

!. Pipette out !# ml of #.! $ o*ali+ a+i, into a +on+ialflas4 an, a,, !# ml of ,il."so&.

". 7arm the +ontents of the flas4 8# 0 an, titrate /ith%Mno&solution.'. 0ontinue the titra+tion until a faint pin4 +olour is

pro,u+e, . Repeat the titrations for +on+or,ant values.

&. 2nter the values in a ta-ular form.

(-).For Assay :!. 7eigt a++urately a-out ! gm of Mohr`s salt an,

,issolve in a mi*ture of "# ml of ,istille, /ater an, "#

ml of ,il."so&.". Titrate the +ontents of the flas4 /ith o.!$ %Mno&

solution until a permanent pin4 +olour is o-taine,.

'. Repeat the titration for +on+or,ant-values. 2nter thevalues in a ta-ular form.

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29IA12$T 5R I.P. FA0T5R :2a+h ml of #.! n %Mno&; #.#'