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On addition of 2mL of 5% NaCl to 10 mL gold sol in the presence of 0.025 g starch , the coagulation is just prevented. What is the gold number of starch ? |
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Answer» Solution : 0.025 g of STARCH just prevent the coagulation of 10mL GOLD sol on the addition of 2mL of 5% NaCl or 0.025 g of starch just prevents the coagulation of 10mL gold sol on the addition of 1ML of 10% NaCl. Milligrams of starch which just prevent the coagulation of 10mL gold sol. on the addition of 1 mL 10% NaCl = 25 `:.` Gold number of starch = 25 . |
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