Question

What is the chemical reaction taking place here? I thought it was Zn(CN)2 but it is not a denim blue.

The Soluble Hydroxide Group: Analyze the Solution for the Presence of Znº and All 25. To test for All, add 10 drops of 6 M HNO, solution to Test Tube 5. Check the pH of the solution. If it is not acidic, add more 6 M HNO, dropwise until the solution becomes acidic. Add 6 M NH, solution dropwise until the solution is basic, and then add an additional 3 drops of 6 M NH Stir the mixture. If a gelatinous precipitate forms, then Al' ions are present. This precipitate is difficult to see. Centrifuge the test tube and check again for the precipitate. After centrifuging the test tube, transfer the supernatant to Test Tube 10. 26. To confirm the presence of Al" ions, add 6 M HCl solution to Test Tube 5 dropwise until the precipitate dissolves. Stir the solution, and add 3 drops of aluminon solution. Add 6 M NH, solution dropwise until the mixture is basic. Centrifuge the test tube. If the precipitate is now a red color, then Al" ions are indeed present. 27. To test for Zn, and complete the qual scheme for cations, add 6 M HCl solution dropwise to Test Tube 10 until the liquid is acidic. Add 3 drops of 0.1 MK [Fe(CN)) and stir the mixture. Allow the chemicals to react for up to 10 minutes. Centrifuge the test tube. If there is a precipitate (its color could be white or light green or blue ) in the test tube, then there are Zn ions present. Dispose of the contents of Test Tubes 5 and 10 as directed.

Answer 1

• A13+ + 3Nth + 3tho ag.) Eig.) (e) Alloh + 3NHy + White (s) (09.) gelatinuus ppt. © Zn2+ (9) . 227 + (9.) + 2NH3 +240 + Enlatha + 2NH4+ 619) Ce) gelatoriaus p? rag) Ku Fe (CM) – Kz Zanz [Fe (CN) 6 1 2 (19.) gray-white ppte