MIDTERM GROUP 1 ANIONS

Question 1

the calcium salts of the anions Group 1 are ___________ in netural or slightly basic solution.

Answer 1

insoluble

Question 2

Group 1 Anions Precipitating Agent

Answer 2

Calcium Acetate

Question 3

Group 1 Anions are divided into 2 subgroups by the action of _____________

Answer 3

dilute Acetic Acid

Question 4

They are insoluble to 3M HAc

Answer 4

Calcium Flouride and Calcium Oxalate

Question 5

The Soluble groups should be analyzed immediately after solution is ____________

Answer 5

effected

Question 6

FIRST DAY OF ANALYSIS involves the detection of what ion?

Answer 6

Carbonate Ion

Question 7

FIRST DAY OF ANALYSIS: In the first step, what are you going to put inside the test tube (mixture)

Answer 7

10 drops of 3M HCl
10 drops of distilled water
0.1g of KClO3

Question 8

10 drops of 3M HCl
10 drops of distilled water
0.1g of KClO3
Then add 10 drops of unknown sample.

What indicates the presence of Carbonate Ion?

Answer 8

Vigorous effervescence (murag sa sparkles sa wine)

Question 9

FIRST DAY OF ANALYSIS: What amount of distilled water will you put in the remaining unknown sample?

Answer 9

equal to the number of drops of the remaining unknown sample

Question 10

FIRST DAY OF ANALYSIS: Amount of 1.5 M Na2CO3 solution to be added after the water bath for 2 minutes?

Answer 10

equal to the number of drops of the sample

Question 11

FIRST DAY OF ANALYSIS: In the first centrifuge, which part of the separated molecules are you going to discard?

Answer 11

precipitate

Question 12

FIRST DAY OF ANALYSIS: The centrifugate obtained in procedure number 2 what Solution are you going to add to make the precipitation complete?

Answer 12

2M Ca(Ac)2 drop by drop

Question 13

What is the maximum drops for 2M Ca(Ac)2?

Answer 13

15 drops

Question 14

In procedure #3, after the centrifuge, what separated part are you going to discard?

Answer 14

centrifugate

Question 15

The residue may contain?

Answer 15

Insoluble:
- calcium salts of carbonate
- sulfite
- arsenite
-arsenate
- phosphate
-oxalate
-flouride ions

Question 16

What solution are you going to add to the residue/precipitate before the last centrifuge of the Day 1 Analysis?

Answer 16

15 drops of 3M HAc