Experiment 26C.11 5 of 5 Constants | Periodic Table Part A Given an unknown samp

Question

Experiment 26C.11 5 of 5 Constants | Periodic Table Part A Given an unknown sample that could contain Cr Mn2+, and/or Fe2+, you strip the metal ions from the chalk using hydrochloric acid, concentrate the resulting solution, and add sodium hydroxide. You then add sodium hypochlorite and ammonium hydroxide. After boiling and centrifuging the product, you isolate the solution by decantation. You wash the remaining solid twice with water and sodium hydroxide. Then, water and sulfuric acid are added to this solid. The decanted solution is yellow, and you add barium chloride, boil and centrifuge. The resulting solid is washed and centrifuged, and nitric acid is added. Water is added and to the resulting orange solution, hydrogen peroxide is added, resulting in a blue solution. The solution made by adding sulfuric acid to the earlier solid is stirred, has hydrogen peroxide added to it, and then boiled. After adding water to the boiled solution, you separate it into two test tubes. To one tube you add potassium thiocyanate and no color forms. To the second tube, you add a few grains of sodium bismuthate. You mix this solution and centrifuge. You observe a pink/purple solution. Which cations are present in your unknown sample? List the metal symbols in alphabetical order, separated by commas. Submit Previous Answers Reguest Answer Incorrect, Try Again: 3 attempts remaining Part B Which group IIl cations are not present in your unknown sample? List the metal symbols in alphabetical order, separated by commas. Fe Submit Previous Answers Reguest Answer Incorrect, Try Again: 5 attempts remaining

Explanation / Answer

Qualitative analysis of metal cations

Part A)

The cations that are present in the unknown solution

Fe2+ and Mn2+

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Part B) The cations that are absent in the unknown solution

Cr3+

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