chemistry

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.

  1. 👍 0
  2. 👎 0
  3. 👁 139
asked by jan

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    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

    asked by Jan on March 6, 2011
  2. Chemistry-please help

    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

    asked by Jan on March 8, 2011
  3. general chemistry

    I need the oxidation half reactions, reduction half reactions, and net ionic equations for the following reactions: 1)magnesium +0.1M zinc sulfate 2)copper+0.1M zinc sulfate 3)zinc+0.1M copper(II)sulfate 4)zinc+3M HCl 5)copper+3M

    asked by masooma on November 13, 2010
  4. Chemistry

    The synthesis of zinc iodide was performed using 1.8912g of zinc and 1.5965g of iodine. Determine the limiting reactant and calculate the theoretical yield of zinc iodide in grams.

    asked by Cj on October 7, 2014
  5. Chemistery

    Writing the net ionic equation for sodium fluoride+hydrochloride, magnesium iodide + lead (II) acetate sliver (I) acetate + potassium iodide nickel (II) sulfate + barium chloride barium acetate + ammonium sulfate barium hydroxide

    asked by Anonymous on June 10, 2016
  6. Chemistry

    Writing the net ionic equation for sodium fluoride+hydrochloride, magnesium iodide + lead (II) acetate sliver (I) acetate + potassium iodide nickel (II) sulfate + barium chloride barium acetate + ammonium sulfate barium hydroxide

    asked by Lesley on June 10, 2016
  7. Chemistry-Gases

    A common laboratory preparation of hydrogen on a small scale uses the reaction of zinc with hydrochloric acid. Zinc chloride is the other product. (a) If 13.0 L of H2 at 765 torr and 20.0 °C is wanted, how many grams of zinc are

    asked by Anonymous on April 2, 2014
  8. Math

    You are asked to prepare zinc oxide paste using the following formula: Zinc oxide 1 part Calamine 1 part Starch 2 parts Petrolatum 4 parts How many farms if each component will you use to prepare 3 ounces of the product?

    asked by Natasha on April 7, 2019
  9. chemistry

    In the preparation of ammonia, why should the mixture of ammonium chloride and calcium hydroxide be a paste, not dry powder?

    asked by clive on November 29, 2015
  10. Chemistry

    When zinc metal is reacted with hydrochloric acid, zinc chloride and hydrogen gas are produced. If 25ml of 0.2M HCl and 0.3g of zinc metal is used: a. how many M of zinc chloride will be produced? b. how many M of zinc chloride

    asked by Eirin on July 26, 2016

More Similar Questions