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Gold number of gum arabic is 0.15. The amount of gum arabic required to protect 100mL of red gold sol from coagulated bu 10mL of 10% NaCl solution is |
0.15 millimoles 0.15mg 1.5millimoles 1.5 mg |
1.5 mg |
By definition, amount required for 10mL of gold sol = 0.15mg ∴ Amount required for 100mL of gold sol = 0.15 x 10 = 1.5mg
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