PICLAB: SEPARATION OF CATIONS

Question 1

• Measurement science
• Has two types: QUALITATIVE and QUANTITATIVE

Answer 1

ANALYTIC CHEMISTRY

Question 2

• It reveals the quality of substance
• Answers the question ‘What is?’

Answer 2

QUALITATIVE

Question 3

• Indicates the amount of each substance
• Answers the question ‘How much?’

Answer 3

QUANTITATIVE

Question 4

To determine an ion with out a label, you add a _______

Answer 4

CHLORIDE SOLUTION

Question 5

MEMORIZE:
GROUP 1
- Known as ‘Insoluble chlorides’
- Precipitant: 6M HCl (hypochloric acid)

Answer 5

MercuLeS
MERCUROUS, LEAD, SILVER

Question 6

MEMORIZE:
GROUP 2A
- Insoluble in Na2S
- Precipitants: 5% - Thioacetamide diluted solution

Answer 6

Copper-CaBLe
COPPER, CADMIUM, BISMUTH, LEAD

Question 7

MEMORIZE:
GROUP 2B
- Soluble in Na2S
- Acid, Insoluble sulfides
- Precipitants: 5% - Thioacetamide diluted solution

Answer 7

MArTiAn
MERCURIC, ARSENIC, TIN, ANTIMONY

Question 8

MEMORIZE:
GROUP 3A
- Soluble in 1M HCl
- Precipitant: 5% Thioacetamide in NH3

Answer 8

NiCo
NICKLE, COBALT

Question 9

MEMORIZE:
GROUP 3B
- Insoluble in 1M HCl
- Precipitant: 5% Thioacetamide in NH3

Answer 9

ZACh Iron Man
ZINC, ALUMINUM, CHROMIUM, IRON, MANGANESE

Question 10

Will always form a precipitate

Answer 10

SILVER (Ag) and LEAD (Pb)

Question 11

Will always form a white precipitate

Answer 11

ZINC

Question 12

MEMORIZE:
GROUP 4
- Insoluble Carbonates/ Soluble sulfides
- All precipitants are White
- Precipitant: Ammonium carbonate (NH4)2CO3 + 95% Ethanol

Answer 12

BaCal St.
BARIUM, CALCIUM, STRONTIUM

Question 13

MEMORIZE:
GROUP 5
- Known as the ‘Soluble group’
- Clear colorless solution
- Precipitant: None

Answer 13

PoLiS Magnum Ammo
POTASSIUM, LITHIUM, SODIUM, MAGNESIUM, AMMONIUM

Question 14

• Precipitant: None

Answer 14

GROUP V
PoLiS Magnum Ammo
POTASSIUM, LITHIUM, MAGNESIUM, AMMONIUM

Question 15

Precipitant: (NH4)2CO3 + 95% Ethanol

Answer 15

GROUP IV
BaCal St.
BARIUM, CALCIUM, STRONTIUM

Question 16

Precipitant: 5% thioacetamide in NH3

Answer 16

GROUP III
NiCo - NICKLE, COBALT
ZACh Iron Man - ZINC, ALUMINUM, CHROMIUM, IRON, MANGANESE

Question 17

Precipitant: 5% thioacetamide in diluted acid

Answer 17

GROUP II
Copper-CaBLe - COPPER, CADMIUM, BISMUTH, LEAD
MArTiAn - MERCURIC, ARSENIC, TIN, ANTIMONY

Question 18

Precipitant: 6M HCl

Answer 18

GROUP I
MercuLeS
MERCUROUS, LEAD, SILVER

Question 19

COLOR OF PRECIPITATED SULFIDES
CAUSED BY:
Cd+2, Sn+2 (Brown), As+2, As+5

Answer 19

OBSERVATION:
YELLOW

Question 20

COLOR OF PRECIPITATED SULFIDES
CAUSED BY:
Sb+2, Sb+5 (Orange-red)

Answer 20

OBSERVATION:
ORANGE

Question 21

COLOR OF PRECIPITATED SULFIDES
CAUSED BY:
- Zn+2

Answer 21

OBSERVATION:
WHITE

Question 22

COLOR OF PRECIPITATED SULFIDES
CAUSED BY:
Mn+2

Answer 22

OBSERVATION:
PINK

Question 23

COLOR OF PRECIPITATED SULFIDES
CAUSED BY:
Cu+2, Bi+3, Pb+2, Sn+4, Hg+2, Co+2, Ni+2, Ag+, Fe+2

Answer 23

OBSERVATION:
BLACK