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The gold number of gelatin is 0.01 . Cal...

The gold number of gelatin is `0.01` . Calculate the amount of gelatin to be added to `1000mL` of a colloidal sol of gold to prevent its coagulation, before adding `1mL` of `10%NaCl` solution.

A

2

B

1

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
B
Gold number of gelatin `=0.01`
or `0.01mg` gelatin required to be added to `10mL` of gold sol to completely prevent coagulation of `1mL` of `10%NaCl` solution.
Therefore gelatin added to `1000mL` of gold sol to
prevent coagulation `=(0.01xx1000)/(10)=1mg` .
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