QUESTION 1 You follow the first few steps of the lab for the known solution, unt

Question

QUESTION 1

You follow the first few steps of the lab for the known solution, until you come to the point in the experiment where you have just added water and 6M H2SO4 to Test Tube 1 (before the addition of these reagents the test tube contained MnO2 (s), Co(OH)2 (s), Fe(OH)3 (s), and CuO2 (s)). Which two ions are present in the supernatant after the reagents are added?

Mn2+ and Co2+

  Mn2+ and Fe3+

Co2+ and Cu2+

Fe3+ and Cu2+

2 points   

QUESTION 2

You follow the experimental procedure of the lab for the unknown solution. At the end of the experiment, Test Tube 1 has a yellow ppt. This indicates the presents of which cation in the original solution.

Mn2+

Co2+

Fe3+

Cu2+

2 points   

QUESTION 3

You follow the experimental procedure of the lab for the unknown solution. In Test Tube 3, you add 1 mL of 6M HNO3 and a small scope of solid sodium bismuthate, then you stir the contents of the test tube to determine if Mn2+ is present. What color solution would indicate the Mn2+was present in the original solution?

Yellow

Blue

Purple

Deep Red

2 points   

QUESTION 4

You follow the experimental procedure of the lab for the unknown solution. Just after you centrifuge the contents of Test Test 4, you notice that the solution is blue in color. This indicates the presence of which of the four cations used in this lab?

Cu2+

Mn2+

  Co2+

Fe3+

2 points   

QUESTION 5

You follow the experimental procedure of the lab for the known solution. At the end of the experiment which Test Tube will contain the Fe3+ (it will be [Fe(SCN)]2+ at the end of the experiment)?

Test Tube 1

Test Tube 2

  Test Tube 3

  Test Tube 4

Mn2+ and Co2+

  Mn2+ and Fe3+

Co2+ and Cu2+

Fe3+ and Cu2+

Explanation / Answer

(1) two ions are present in the supernatant after the reagents added are Mn2+ and Fe3+v

(2) yellow ppt represents the presence of  Fe3+

(3) Mn2+ gives purple colour

(4) Blue colour is due to the presence of Cu2+

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