tests for ions

Question 1

Cu2+

Answer 1

NaOH, light blue PPT forms

excess NaOH forms deep blue solution

Question 2

iron (ii) Fe2+ (green)

Answer 2

aq NaOH, green PPT forms

Question 3

iron (iii) Fe3+ (yellow)

Answer 3

aq NaOH, brown PPT forms

Question 4

NH4+

Answer 4

WARM NaOH litmus paper goes from red to blue, smells of ammonia

Question 5

Mn2+

Answer 5

NaOH pink PPT forms

Question 6

CO32-

Answer 6

react with acid, CO2 given off (limewater)

Question 7

SO42-

Answer 7

Dilute HCl, BaCl2, white PPT formed

Question 8

Cl-

Answer 8

AgNO3 (silver nitrate) white PPT. dissolves in DILUTE ammonia

Question 9

Br-

Answer 9

AgNO3 (silver nitrate) cream PPT. dissolves in CONC ammonia

Question 10

I-

Answer 10

AgNO3 (ailver nitrate) yellow PPT. DOESNT dissolve in ammonia

Question 11

Mn2+

Answer 11

pink before, NaOH: brown PPT

Question 12

Cr3+

Answer 12

violet green before, NaOH grey green PPT, excess NaOH, green solution