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Gold number of gum arabic is 0.15. The amount of gum arabic required to protect 100 mL of red gold sol from coagulation by 10 mL of 10% NaCl solution is |
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Answer» `0.15` milimoles `=0.15xx10=1.5mg` (NOTE that for 10 mL of gold sol, 1 mL of `10%` mL of `10%` NaCl sol. Is required). |
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