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
Looks ok to me.
Yes, I got the same answers as well.
same answers confirmed by instructor
To determine the correct answers, let's analyze the given information step by step:
1. A portion of test tube #1 added to a portion of test tube #3 produces a yellow, silver iodide precipitate.
This indicates that the solution in test tube #1 contains silver ions (Ag+) and the solution in test tube #3 contains iodide ions (I-). The yellow precipitate formed suggests the formation of silver iodide (AgI).
2. A portion of test tube #1 added to a portion of test tube #2 produces a black, silver sulfide precipitate.
This suggests that the solution in test tube #1 contains silver ions (Ag+) and the solution in test tube #2 contains sulfide ions (S2-). The black precipitate formed indicates the formation of silver sulfide (Ag2S).
Based on these observations, we can conclude the following:
a. Your conclusions:
Test Tube 1: Silver nitrate (AgNO3)
Test Tube 2: Sodium sulfide (Na2S)
Test Tube 3: Potassium iodide (KI)
b. The balanced equation for the formation of silver iodide, AgI, from a mix of the selected solutions is:
AgNO3 + KI -> AgI + KNO3
c. The balanced equation for the formation of silver sulfide, Ag2S, from a mix of the selected solutions is:
2AgNO3 + Na2S -> Ag2S + 2NaNO3
Therefore, your answers are correct:
Test Tube 1: AgNO3
Test Tube 2: Na2S
Test Tube 3: KI
B. AgNO3 + KI -> AgI + KNO3
C. 2AgNO3 + Na2S -> Ag2S + 2NaNO3