The coagulation of `100 mL` of a colloidal solution of gold is completely prevented by the addition of `0.030 g` of it before adding `1 mL` of `10% NaCl` solution. Find out the gold number of starch?
Text Solution
AI Generated Solution
To find the gold number of starch based on the given information, we can follow these steps:
### Step 1: Understand the Gold Number
The gold number is defined as the minimum amount of a protective colloid (in milligrams) that prevents the coagulation of 10 mL of a gold sol when a specific amount of an electrolyte is added. In this case, we are using starch as the protective colloid.
### Step 2: Identify Given Data
- Volume of colloidal gold solution (V) = 100 mL
- Mass of starch added (m) = 0.030 g = 30 mg (since 1 g = 1000 mg)
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The coagulation of 200 ml of a colloidal solution of gold is completely prevented by adding 0.50 gm of starch to it before adding 1 ml of 10% NaCl solution. Calculate the gold number of starch.
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