Practical 1 - identification of unknown substances by qualitative analysis

Question 1

How do you prepare for this test?

Answer 1

1- Table for expected observations with each solution - will it form a precipitate?
2- Summary of the observations expected of each salt
3- Another table but with A-F instead of their names

Question 2

How would we know if two solutions will form a precipitate?

Answer 2

Insoluble

Question 3

Precipitate

Answer 3

Solid that forms when two solutions react

Question 4

How do we actually do the test?

Answer 4

Approximately 2cm3 of each solution with a few drops of each other solution and turn records in the second table

Question 5

Which solutions formed YELLOW precipitates in our experiment?

Answer 5

Pb(No3)2 and KI

Question 6

What type of solutions were the ones we used?

Answer 6

Salts

Question 7

Which salts were used in our experiment?

Answer 7

Na2CO3
Pb(No3)2
Ba(No3)2
Zn(No3)2
KI
MgSO4

Question 8

Which of the substances used were toxic?

Answer 8

Pb(No3)2 and Ba(No3)2

Question 9

What’s the risk with Pb(No3)2 and Ba(No3)2?

Answer 9

Toxic

Question 10

What did Na2CO3 form for us?

Answer 10

4 white precipitates

Question 11

What did Pb(No3)2 form for us?

Answer 11

2 white precipitates, 1 yellow

Question 12

What did Ba(No3)2 form for us?

Answer 12

2 white precipitates

Question 13

What did Zn(NO3)2 form for us?

Answer 13

1 white precipitate

Question 14

What did KI form for us?

Answer 14

1 yellow precipitate

Question 15

What did MgSO4 form for us?

Answer 15

3 white precipitates