Purple of Cassius is prepared by reducing \( \mathrm{AuCl}_{3} \) t...
0Purple of Cassius is prepared by reducing \( \mathrm{AuCl}_{3} \) to
\( P \) colloidal gold by \( \mathrm{SnCl}_{2} \). A \( 1 \mathrm{~L} \) solution containing
W. \( 1.97 \mathrm{mg} \) of gold per \( \mathrm{ml} \) is prepared from \( 0.05 \mathrm{M} \) - solution of \( \mathrm{AuCl}_{3} \) by reduction with appropriate - amount of \( 0.05 \mathrm{M}-\mathrm{SnCl}_{2} \) solution, the resulting - solution being diluted to \( 1 \mathrm{~L} \) with water. The - volume of stannous chloride solution required, if its oxidation product is \( \mathrm{SnCl}_{4}(\mathrm{aq}) \), is \( (\mathrm{Au}=197) \)
(a) \( 300 \mathrm{ml} \)
(b) \( 500 \mathrm{ml} \)
- (c) \( 800 \mathrm{ml} \)
(d) \( 100 \mathrm{ml} \)
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