The gold number of gelatin is 0.01. Calculate the amount of gelatin to be added to 1000 mL of a colloidal sol of gold to prevent its coagulation before adding 1 mL of 10%NaCl solution.
A
2
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B
1
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C
4
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D
5
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Solution
The correct option is C1 Gold number of gelatin =0.01. This means that 0.01 mg gelatin is required to be added to 10 mL of gold sol to completely prevent coagulation of 1 mL of 10%NaCl solution. Therefore, gelatine added to 1000 mL of gold sol to prevent coagulation =0.01×100010=1 mg.