MIDTERM 02 - Tables

Question 1

Soft - Hardness of water

Answer 1

0-30 mg/L CaCO3

Question 2

Moderately soft - Hardness of water

Answer 2

30-60 mg/L CaCO3

Question 3

Moderately hard - Hardness of water

Answer 3

60-120 mg/L CaCO3

Question 4

Hard - Hardness of water

Answer 4

120-180 mg/L CaCO3

Question 5

Very hard - Hardness of water

Answer 5

> 180 mg/L CaCO3

Question 6

10 ions masked by cyanide (pH=10) - Masking agent

Answer 6

Cu, Co, Ni, Zn, Cd, Hg, Pt, Pd, Ag, Fe

Question 7

3 ions masked by triethanolamine (pH=10) - Masking agent

Answer 7

Sn, Al, Fe

Question 8

3 ions masked by aluminum fluoride (pH=10) - Masking agent

Answer 8

Al, alkaline earths, rare earths

Question 9

2 ions masked by aluminum fluoride (pH=6) - Masking agent

Answer 9

Al, Ti

Question 10

3 ions masked by ascorbic acid (pH=2) - Masking agent

Answer 10

Cu, Fe, Hg

Question 11

Ion masked by ammonia (pH=10) - Masking agent

Answer 11

Zn

Question 12

6 ions titrated with EDTA using cyanide (pH=2) - Masking agent

Answer 12

Pb, Mn, Mg, Ca, Alkaline earths, Rare earths

Question 13

5 ions titrated with EDTA using triethanolamine (pH=10) - Masking agent

Answer 13

Zn, Cd, Pb, Mn, Rare earths

Question 14

3 ions titrated with EDTA using aluminum fluoride (pH=10) - Masking agent

Answer 14

Zn, Cd, Mn

Question 15

Ion titrated with EDTA using aluminum fluoride (pH=6) - Masking agent

Answer 15

Cu

Question 16

2 ions titrated with EDTA using ascorbic acid (pH=2) - Masking agent

Answer 16

Bi, Th

Question 17

Ion titrated with EDTA using ammonia (pH=10) - Masking agent

Answer 17

Cd

Question 18

Mordant black 11, Eriochrome black T, Solochrome black T - Color change

Answer 18

Red to blue

Question 19

Murexide (ammonium purpurate) - Color change

Answer 19

Violet to blue

Question 20

Catechol violet - Color change

Answer 20

Violet to red

Question 21

Methyl blue - Color change

Answer 21

Blue to yellow

Question 22

Thymol blue - Color change

Answer 22

Blue to grey

Question 23

Alizarin - Color change

Answer 23

Red to yellow

Question 24

Sodium alizarin sulphonate - Color change

Answer 24

Blue to red

Question 25

Xylenol orange - Color change

Answer 25

Lemon to yellow

Question 26

Mordant black 11, Eriochrome black T, Solochrome black T - pH range

Answer 26

6-7

Question 27

Murexide (ammonium purpurate) - pH range

Answer 27

12

Question 28

Catechol violet - pH range

Answer 28

8-10

Question 29

Methyl blue - pH range

Answer 29

4-5

Question 30

Thymol blue - pH range

Answer 30

10-12

Question 31

Alizarin - pH range

Answer 31

4.3

Question 32

Sodium alizarin sulphonate - pH range

Answer 32

4

Question 33

Xylenol orange - pH range

Answer 33

1-3, 4-5, 5-6

Question 34

8 metals detected by Mordant black 11, Eriochrome black T, Solochrome black T

Answer 34

Ca, Ba, Mg, Zn, Cd, Mn, Pb, Hg

Question 35

3 metals detected by Murexide (ammonium purpurate)

Answer 35

Ca, Cu, Co

Question 36

5 metals detected by Catechol violet

Answer 36

Mn, Mg, Fe, Co, Pb

Question 37

4 metals detected by Methyl and Thymol blue

Answer 37

Pb, Zn, Cd, Hg

Question 38

5 metals detected by Alizarin

Answer 38

Pb, Zn, Co, Mg, Cu

Question 39

2 metals detected by Sodium alizarin sulphonate

Answer 39

Al, Thorium

Question 40

2 metals detected by Xylenol orange (pH=1-3)

Answer 40

Bi, Thorium

Question 41

2 metals detected by Xylenol orange (pH=4-5)

Answer 41

Pb, Zn

Question 42

2 metals detected by Xylenol orange (pH=5-6)

Answer 42

Cd, Hg