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Purification of Colloidal Solution

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Question

While making a colloidal solution of starch in wrier why is constant stirring required? Should we add dry corn starch to boiling water or boiling water to corn starch? Why?

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Solution

Dear Student,
When preparing a colloidal solution of starch in water constant stirring is needed to avoid formation of lumps . If the solution is not stirred constantly it will form coagulates.
corn starch paste should be added slowly to boiling water to avoid clumping and precipitation

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