On addition of `1 mL` solution of `10% NaCl` to `10 mL` gold sol in th – InterviewSolution

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1.	On addition of `1 mL` solution of `10% NaCl` to `10 mL` gold sol in the presence of `0.0250 g` of starch, the coagulation is just prevented. What is the gold number of starch?
Answer» Amount of starch required `= 0.025 gm` `= 0.025 xx 10^(3) mg` `= 25 mg` Gold Number `= 25.`

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