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  Lionel Chem-Lab - Chapter 11

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NOTE:  This book was published in 1942 as a manual to accompany several Lionel Chemistry sets of the time.  While some of the experiments and activities here may be safely done as written, a number of them use chemicals and methods no longer considered safe.  In addition, much of the information contained in this book about chemistry and other subjects is outdated and some of it is inaccurate.  Therefore, this book is probably best appreciated for its historical value rather than as a source for current information and good experiments.  If you try anything here, please understand that you do so at your own risk.  See our Terms of Use.
Pages 149 - 151

CHAPTER XI

FERROCYANIDES

Almost all of the ferrocyanides are colored and this property is useful in chemical analysis. Most of the metallic salts give precipitates of insoluble ferrocyanides. For the following experiments, dissolve four or five sodium ferrocyanide crystals in water and use the solution in the various experiments as directed.

EXPERIMENT No. 318 Ferric Ferrocyanide

(CL-11, CL-22, CL-33, CL-44, CL-55, CL-66, CL-77)

APPARATUS: Test tube, ferric ammonium sulfate, sodium ferrocyanide solution.

PROCEDURE: Dissolve two measures of ferric ammonium sulfate in a test tube half filled with water. Add a few drops of sodium ferrocyanide solution. Note the deep blue precipitate.

SUMMARY: Ferric ferrocyanide, the deep blue precipitate, is commonly called Prussian blue.

EXPERIMENT No. 319 Ferrous Ferrocyanide

(CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting ferrous ammonium sulfate for ferric ammonium sulfate. The light blue precipitate will be ferrous ferrocyanide.

EXPERIMENT No. 320 Copper Ferrocyanide

(CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting copper sulfate for ferric ammonium sulfate. The precipitate will be copper ferrocyanide.

EXPERIMENT No. 321 Decomposition Of Copper Ferrocyanide

(CL-55, CL-66. CL-77)

APPARATUS: Copper sulfate, sodium ferrocyanide solution, sodium carbonate, calcium oxide, test tubes.

PROCEDURE: Prepare a precipitate of copper ferrocyanide as described in the previous experiment. Dissolve one measure of sodium carbonate in a test tube half full of water. In another test tube, in the same amount of water, dissolve one measure of calcium oxide. Mix the solutions together and filter them through filter paper, col-

149


150 FERROCYANIDES

lecting the filtrate in a clean test tube. Add the above filtrate to the precipitate of copper ferrocyanide. Note how the precipitate dissolves forming a blue-color solution. This blue solution is copper hydroxide.

EXPERIMENT No. 322 Aluminum Ferrocyanide

(CL-33, CL-44, CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting aluminum sulfate for ferric ammonium sulfate. The light brown precipitate will be aluminum ferrocyanide.

EXPERIMENT No. 323 Cobalt Ferrocyanide

(CL-33, CL-44, CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting cobalt chloride for ferric ammonium sulfate. The green precipitate will be cobalt ferrocyanide.

EXPERIMENT No. 324 Manganese Ferrocyanide

(CL-33, CL-44, CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting manganese sulfate for ferric ammonium sulfate. The white precipitate will be manganese ferrocyanide.

EXPERIMENT No. 325 Zinc Ferrocyanide

(CL-44, CL-55, CL-66, CL-77)

Repeat Experiment No. 318 substituting zinc strip for ferric ammonium sulfate. The white precipitate is zinc ferrocyanide.

EXPERIMENT No. 326 A Complex Salt Of Strontium Ferrocyanide

(CL-77)

APPARATUS: Strontium chloride, ammonium hydroxide, sodium ferrocyanide solution, alcohol lamp or candle and test tubes.

PROCEDURE: Dissolve one measure of strontium chloride in a test tube half full of water. Add some sodium ferrocyanide solution. Add a few drops of ammonium hydroxide. Heat solution to the boiling
point.

SUMMARY: The cloudy precipitate is due to the complex salt which is formed.

EXPERIMENT No. 327 Nickel Ferrocyanide

(CL-66, CL-77)

Repeat Experiment No. 318 substituting nickel chloride for ferric ammonium sulfate. The pale blue precipitate is nickel ferrocyanide.

EXPERIMENT No. 328 Another Way To Make Ferric Ferrocyanide

(CL-66, CL-77)

Repeat Experiment No. 318 substituting ferric chloride for ferric

LIONEL CHEM-LAB 151

ammonium sulfate. The precipitate will be ferric ferrocyanide or Prussian blue.

EXPERIMENT No. 329 Calcium Ferrocyanide

(CL-33, CL-44, CL-55, CL-66)

APPARATUS: Calcium chloride, sodium ferrocyanide, two test tubes, alcohol lamp or candle.

PROCEDURE: Dissolve one measure of calcium chloride in a test tube half full of water. Dissolve one measure of sodium ferrocyanide in another test tube containing the same amount of water. Mix the two solutions and heat to the boiling point. Allow test tube to cool.

SUMMARY: The cloudy precipitate is calcium ferrocyanide.

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