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Minimum amount of protective colloid added to 10 \mathrm{~mL} of a standard gold sol to prevent a colour change on the addition of \mathrm{ 1 \mathrm{~mL}\: of \: 10 \%\: \mathrm{NaCl}} solution is called:
 

Option: 1

Flocculation value
 


Option: 2

Gold number
 


Option: 3

Protective power
 


Option: 4

None of the above


Answers (1)

best_answer

Flocculation value :
Flocculation value is the minimum concentration of electrolyte in millimoles required to cause coagulation of one litre of colloidal solution.

\mathrm{ \text { Flocculation value }=\frac{\text { Millimoles of electrolyte }}{\text { Size of particle volume of sol in litre }} }
Gold number:
Gold number is the minimum amount of protective colloid in milligrams which when added to \mathrm{ 10 \mathrm{~mL} }of a standard gold sol just sufficient to prevent a colour change from red to blue on the addition of \mathrm{ 1 \mathrm{~mL}\: of \: 10 \% \: \mathrm{NaCl} } solution.

\mathrm{ \text { Gold number }=\frac{\text { Weight of lyophillic sol in } \mathrm{mg} \times 10}{\text { Volume of gold sol in } \mathrm{mL}} }

\mathrm{ Protective \: power \: of\: protective \: colloids \propto \frac{1}{\text { Gold number }} }

Hence option 2 is correct.
 

Posted by

Ajit Kumar Dubey

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