The coagulation of $100 m L$ of a colloidal solution of gold is completely prevented by adding $0.25 g$ of starch to it before adding $10 m L$ of $10$ % $N a C l$ solution. Find out the gold number of starch.

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Solution

$10 m L$ of $10$ % $N a C l$ solution is added to $100 m L$ of solution of gold.
Thus, $1 m L$ of $10$ % $N a C l$ solution has been added to $10 m L$ solution of gold.
Since, $100 m L$ gold solution required $= 0.25 g$ starch
$= 0.25 \times 10^{3} m g$
So, $10 m L$ gold solution required $= \frac{0.25 \times 10^{3}}{100} \times 10$
$= 25 g$ starch
Thus, by definition, the gold number of starch is $25$ .

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