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Units and Dimensions

If gold numbe...

Question

If gold number for a protective colloid is $0.08$ then how many milligrams would be needed to protect $50 m l$ of a standard gold sol from being coagulated on addition of $5 m l$ of $10$ solution?

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Solution

Gold no. is no. of milligram of protective colloid added $s o l^{n}$ in $1 m l 10$ .
Gold no.(milligram) Gold $s o l^{n}$ $N a C l (10$
$0.08$
$0.08$
$0.4$ $10 m l$
$10 m l$
$50 m l$ $1 m l$
$1 m l \times 5$
$5 m l$

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