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Three colorless solutions in test tubes, with no labels, are in a test tube rack on the lab bench. Lying beside the test tubes are three labels: potassium iodide, KI, silver nitrate, AgNO3, and sodium sulfide, Na2S. You are to place the labels on the test tubes using only the 3 solutions present. Here are your tests:

-A portion of test tube #1 added to a portion of test tube #3 produces a yellow, silver iodide precipitate.
-A portion of test tube #1 added to a portion of test tube #2 produces a black, silver sulfide precipitate.

a. Your conclusions are:
Test Tube 1:
Test Tube 2:
Test Tube 3:

b. Write the balanced equation for the formation of silver iodide, AgI, from a mix of 2 selected solutions provided above.

c. Write the balanced equation for the formation of sulfide, Ag2S, from a mix of 2 selected solutions provided above.

Are my answers right? :

Test Tube 1: AgNO3
Test Tube 2: Na2S
Test Tube 3: KI

B.
AgNO3 + KI -> AgI + KNO3

C.
2AgNO3 + Na2S -> Ag2S + 2NaNO3

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3 answers

  1. Looks ok to me.

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  2. Yes, I got the same answers as well.

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  3. same answers confirmed by instructor

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