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Exactly 8mg of a lyophilic 'sol' is adde...

Exactly 8mg of a lyophilic 'sol' is added to 20ml of a gold sol to protect against addition of 2ml of 20% NaCl. What is the gold number of the given sol?

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The correct Answer is:
2
20 ml of gold sol `rarr` 8 mg
10 ml of gold sol `rarr ?`
2ml `rarr ? 20% NaCl to 4 mg`
`1 ml rarr 10% NaCl rarr ?`
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