11-12 QUESTION 11 2 points Save Answer Stu Dent has a third unknown salt contain

Question

11-12 QUESTION 11 2 points Save Answer Stu Dent has a third unknown salt containing one of the nine anions used in this lab. He performs classification test A, but no reaction occurs. Likewise, classification test B gives no reaction Finally, with classification test C a white milky solution forms When the 3 M nitric acid is added and the solution is stirred, the white solid starts to settle to the bottom of the test tube. Which confirmation test should Stu choose to try? 9 QUESTION 12 2 points Save Answer Noke Lew has a different unknown salt containing one of the nine anions used in this lab. She tries all three classification reactions, but none of them give any reaction. Before she gives up in despair, which confirmation test should Noke choose to try? Oso42 O so32 co OPO43 No3 No2 O halides (Cr, Br.r 2 0 0

Explanation / Answer

Qualitative analysis of anions

11. The student has tried three types of confirmatory tests. A and B gave no precipitate

C gave a milky white precipitate

Therefore the confirmation test stu must try would be, C

halides (Cl-. Br-, I-)

12. When all three tests gave no results.

the student before giving up finally should try the confirmatory test for,

SO3^2-

this anion forms gas upon its confirmatory test and can be easily missed if not carefully oberved. Thus it must be tested for its presence in mixture before giving up.

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