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On addition of 2mL of 5% NaCl to 10 mL g...

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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To find the gold number of starch, we need to follow these steps: ### Step 1: Understand the Concept of Gold Number The gold number is defined as the minimum amount of a protective colloid (in grams) that is required to prevent the coagulation of 10 mL of a gold sol when a specific amount of an electrolyte (in this case, 2 mL of 5% NaCl) is added. ### Step 2: Calculate the Amount of NaCl Added The amount of NaCl in grams can be calculated from the volume and concentration of the NaCl solution: - Concentration of NaCl = 5% ...
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