SATHEE: Qualitative Analysis - Result Question 3

Qualitative Analysis - Result Question 3

####3. In the following reaction sequence in aqueous solution, the species $X, Y$ and $Z$ , respectively, are

(2016 Adv.)

$S_{2} O_{3}^{2 -} \overset{A g^{+}}{\to} \underset{(Clear solution)}{X} \overset{A g^{+}}{⟶} \underset{(White ppt.)}{Y} \overset{With time}{\to} \underset{(Black ppt.)}{Z}$

(a) ${[A g {(S_{2} O_{3})}_{2}]}^{3 -}, A g_{2} S_{2} O_{3}, A g_{2} S$

(b) ${[A g {(S_{2} O_{3})}_{3}]}^{5 -}, A g_{2} S O_{3}, A g_{2} S$

(d) ${[A g {(S O_{3})}_{3}]}^{3 -}, A g_{2} S O_{4}, A g$

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Solution:

$2 S_{2} O_{3}^{2 -} + A g^{+} ⟶ \underset{(Clear solution)}{{A g {(S_{2} O_{3})}_{2}]}^{3 -}}$

${[A g {(S_{2} O_{3})}_{2}]}^{3 -} + 3 A g^{+} ⟶ \underset{(White ppt.)}{2 A g_{2} S_{2} O_{3}}$

$A g_{2} S_{2} O_{3} + H_{2} O ⟶ \underset{(Black ppt.)}{A g_{2} S + H_{2} S O_{4}}$

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Qualitative Analysis - Result Question 3

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