QUESTION 3 pointsSave Answer Stu Dent observes the following results while worki

Question

QUESTION 3 pointsSave Answer Stu Dent observes the following results while working on his unknown cation solution. Help Stu identify which three cations are present based on his observations. Step A4 = a colorless solution. solid (might be light blue color?) many DI water washes on solid. Results in white translucent precipitate colorless solution translucent), colorless solution Steps B12-13-intense royal blue solution, with a hard-to-see Step B 17-18 = transfer royal blue solution to another test tube. Do Step B19 = all the translucent white solid dissolves into a Step D26-28 = forms a pink-red precipitate (still slightly Step E30 = a white precipitate forms in a royal blue solution Step F36 = a white precipitate forms, slightly stained with pink Step G41 = a maroon precipitate forms Which cations are present in Stu's solution? QUESTION 4 2 points Save Answer The next six questions address contamination issues when a small amount of one cation is not completely removed before the test for another cation is performed Predict the appearance of the final Pb precipitate if Fe contamination is present. the desired precaptate wil not form property (stil dissolved in solution) the preciptate appears exactly the same as without contamination stained to pale pink > white mixed with rusty brown stained with copper oolor pure white stained to pale blue-grey O stained with royal blue O deep black

Explanation / Answer

Qualitatitve analysis

3. For the given qualitative analysis sequence of metal cations,

the identity of the three possible cations in solution would be,

Fe3+ [forms royal blue solution]

Al3+ [gives white precipitate stained with pink]

Cu2+ [gives maroon precipitate]

4. If small amount of Fe is left in the solution, the resulting precipitate of Pb which is generally yellow is color would not appear as,

deep black

The sulfides formed of Group II metal cations and having Pb2+ impurity would appear as black precipitate of sulfide.

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