Question:
On addition of the 1ml. solution of \(10\%\) NaCl to 10ml gold sol in the presence of 0.00399gm of starch calculate the gold no.
On addition of the 1ml. solution of \(10\%\) NaCl to 10ml gold sol in the presence of 0.00399gm of starch calculate the gold no.
Updated On: Aug 9, 2023
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Solution and Explanation
Gold number is the protective power of a colloidal solution against coagulation.
Gold number = \(\frac{\text{volume of gold sol coagulated}}{\text{weight of protective colloidal used}}\)
In the question, 1 ml of \(10\%\) NaCl.
Gold number = 1000 x 0.00399 = 4
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