Qualitative Analysis of Cations (Experiment 2)

Question 1

Qualitative analysis of ions involves _ and ____ of elements present in an unknown sample.

Answer 1

Detection and Identification

Question 2

This is usually done based on the different chemical and physical properties of the ions.

Answer 2

Qualitative Analysis of Cations

Question 3

Usually the sample is first made ____ , followed by a series of reactions that aims to ____ or form the ____ present in the sample.

Answer 3

Usually the sample is first made Aqueous followed by a series of reactions that aims to Precipitate or form the complex ions present in the sample.

Question 4

In a given solution with more than one____ , it is important to develop an ____.

Answer 4

unknown cation; identification scheme

Question 5

The __________ are grouped according to their similarities.

Answer 5

Cations

Question 6

The most used identification scheme was developed by who?

Answer 6

Carl Remegius Fresenius

Question 7

He was a German Chemist and one if his best-known work is ______________

Answer 7

Professor Carl Remegius Fresenius; Qualitative Analysis

Question 8

Nationality and Job of Professory Carl Remegius Fresenius

Answer 8

German Chemist

Question 9

The ____________ cations of the Fresenius Cation Grouping will be analyzed.

Answer 9

Group 1

Question 10

Once the cation has been ____________, it is important to perform other tests to confirm its identity.

Answer 10

Isolated

Question 11

The technician/custodian should prepare the following:

Test Solution mixture of the following:

Answer 11

• 0.05M Silver Nitrate, AgNO3
• 0.05M Copper (II) Nitrate, Cu(NO3)2
• 0.05M Ferric Nitrate, Fe(NO3)3
• 0.05M Zinc Nitrate, Zn(NO3)2

Question 12

Reagents

Answer 12

• 6M Acetic Acid, CH3COOH
• 6M Sulfuric Acid, H2SO4
• 6M Ammonia. NH3
• 0.1M Potassium Ferrocyanide, K4[Fe(CN)6]
• Unknown Solution
• 6M Hydrochloric Acid, HCI
• 6M Sodium Hydroxide, NaOH
• 0.1 Potassium Thiocyanate, KSCN

Question 13

Others:

Answer 13

Litmus Paper

Question 14

Instrument:

Answer 14

Centrifuge

Question 15

A laboratory device that is used for the separation of fluids, gas or liquids, based on density.

Answer 15

Centrifuge

Question 16

Label 2 test tubes as ____ and ____

Answer 16

“A” and “UNK”

Question 17

Procedures:

Answer 17

1. Separation and Confirmation of Silver (I)
2. Separation of Zinc from Copper(II) and Iron (III)
3. Separation and Confirmation of Copper (II)
4. Confirmation of Iron (III)
5. Confirmation of Zinc (II)

Question 18

Group 1 cations

Answer 18

Ag+, Hg2 2+, Pb2+

Question 19

Group 1 cations form precipitates with __________

Answer 19

Hydrochloric Acid

Question 20

Group 2 cations

Answer 20

Hg2+, Cu2+, Bi3+, Cd3+, As3+, As5+, Sb3+, Sb5+, Sn2+, Sn4+

Question 21

Group 2 cations form precipitates with __________ in _________

Answer 21

Hydrogen Sulfide
Dilute Mineral Acid Medium

Question 22

Group 3 cations

Answer 22

Cr3+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+, Al3+, Zn2+

Question 23

Group 3 cations form precipitates with __________ in neutral or ________

Answer 23

Ammonium Sulfide
Ammoniacal Medium

Question 24

Group 4 cations

Answer 24

Ca2+, Sr2+, Ba2+

Question 25

Group 5 cations

Answer 25

Mg2+, Li+, Na+, K+, NH4+

Question 26

Group 4 cations form precipitates with ________ in the presence of ________ in neutral medium.

Answer 26

Ammonium Carbonate
Ammonium Chloride

Question 27

Group 5 cations ______________ and form precipitates with any ________ of the previous groups.

Answer 27

Do not react
reagents