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The coagulation of 100 mL of a colloidal...

The coagulation of 100 mL of a colloidal solution of gold is completely prevented by adding 0.25 g of starch to it before adding 10mL of 10% NaCl solution. Find out the gold number of starch .

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10 mL of 10% NaCl solution is added to 100 mL of solution of gold.
Thus , 1 mL of 10% NaCl solution has been added to 10 mL solution of gold.
Since , 100 mL gold solution requried = 0.25 g starch
`= 0.25 xx 10^(3) ` mg starch
So , 10 mL of solution required `= (0.25 xx 10^(3))/(100) xx 10`
`=25mg ` starch
Thus , by definition , the gold number of starch is 25.
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