PAG 4 Qualitative analysis of ions

Question 1

test for carbonate

Answer 1

add dilute HNO3
effervescence produced

Question 2

equation for carbonate test

Answer 2

Question 3

test for sulfate

Answer 3

add Ba(NO3)2
white precipitate of BaSO4 is formed

Question 4

equation for sulfate test

Answer 4

Question 5

chloride test

Answer 5

add AgNO3
white precipitate forms
dissolves in dilute NH3

Question 6

bromide test

Answer 6

add AgNO3
cream precipitate forms
dissolves in conc NH3

Question 7

iodide test

Answer 7

add AgNO3
yellow precipitate forms
does not dissolve in conc NH3

Question 8

ammonium test

Answer 8

add NaOH and heat solution
NH3 gas is produced
turns pH indicator paper from red to blue

Question 9

equation for ammonium test

Answer 9

Question 10

test for Cu2+

Answer 10

add NaOH
blue precipitate of Cu(OH)2 is produced

Question 11

equation for Cu2+ test

Answer 11

Question 12

test for Fe2+ test

Answer 12

add NaOH
green precipitate of Fe(OH)2 is produced

Question 13

equation for Fe2+ test

Answer 13

Question 14

test for Fe3+

Answer 14

add NaOH
orange-brown precipitate of Fe(OH)3 is produced

Question 15

equation for Fe3+ test

Answer 15

Question 16

test for Mn2+

Answer 16

add NaOH
light-brown precipitate of Mn(OH)2 is produced

Question 17

equation for Mn2+ test

Answer 17

Question 18

test for Cr3+

Answer 18

add NaOH
green precipitate of Cr(OH)3 is produced
dissolves in excess NaOH
produces dark-green solution

Question 19

equations for Cr3+ test

Answer 19

Question 20

which ions dissolve in ammonia?

Answer 20

Cu2+
Cr3+