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1 mL of 10% NaCl solution on addition to...

1 mL of 10% NaCl solution on addition to `100 cm^(3)` standard gold sol in presence of `10^(-4)` gelatin just prevents the coagulation of that sol. Find the gold number of gelatin.

Text Solution

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100 mL of gold sol requires `10^(-4)` g of gelatin .
`therefore 10 cm^(3)` of gold sol requires `(10^(-4)xx10)/(100)=10^(-5) g=0.01 mg`
`therefore ` Gold number of gelatin =0.01
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