The gold number of gelatin is 0.005 (i.e., 5 ml of gold sol requires 0.5 mg of gelatin for protection from coagulation). How much gelatin (in mg) would be required to protect 10 ml of the same gold sol from coagulation?

Question

Accepted Answer

1 mg. 5 mL of gold sol requires 0.5 mg gelatin. By proportionality, 10 mL requires (0.5 * 10)/5 = 1 mg of gelatin.

The gold number of gelatin is 0.005 (i.e., 5 ml of gold sol requires 0.5 mg of gelatin for protection from coagulation). How much gelatin (in mg) would be required to protect 10 ml of the same gold sol from coagulation?

Solution

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