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September 2, 2014

Homework Help: Chemistry-please help

Posted by Jan on Tuesday, March 8, 2011 at 3:38pm.

What is the purpose of adding
zinc chloride in the preparation of starch iodide paste?
Please refer to the procedure below: -
Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of water, then add 2g of zinc chloride dissolved in 10mL of water, and, while the solution is boiling, add, with stirring, a smooth suspension of 5g of soluble starch in 30mL of cold water. Continue to boil for 2 mins, then cool.

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