Tests For Ions Flashcards Preview

A level Chemistry > Tests For Ions > Flashcards

Flashcards in Tests For Ions Deck (14):
1

Mg 2+ (aq)

Add Dil. NaOH, white ppt forms
Mg2+(aq) + 2OH-(aq) --> Mg(OH)2(s)

2

NH4+

Add dil. NaOH, Warm, test gas with red litmus or heat the solid

NH4+(aq) + OH-(aq) --> NH3(g) +H2O(l)
NH3, alkaline gas
NH4+ sublimes to produce a white solid further up the test tube

3

Cl-

1) Acidify with dil. HNO3, Add AgNO3 dropwise to the ppt. Add dil. NH3 followed by conc NH3

White ppt AgCl soluble in Dil NH3

2) Add conc. H2SO4 to solid sample

Steamy Fumes, HCl

4

Br-

Same as Cl-
1) Cream ppt AgBr, soluble in concert NH3
2) steamy fumes HBr, orange fumes Br2

3) add Chlorine water until no change

Solution turns brown

5

I-

Same as Br-
1) yellow ppt of AgI Not soluble in conc NH3
2) steamy fumes HI, black solid I2
3)Solution Turns brown

6

SO42-

Add BaCl2 dropwise followed by HCl sol.,

White ppt forms, BaSO4, Unchanged with HCl

7

CO3 2-

Add acid, test gas by bubbling through limewater,

Colourless solution, effervescence, limewater goes milky

8

HCO3 2-

Heat aqueous solution

Effervescence, limewater goes milky

9

Oxygen

Glowing splint relights

10

Carbon dioxide

Lime water goes milky

11

Ammonia

Red litmus goes blue, with HCl white smoke produced

12

Nitrogen dioxide

This is a brown has, blue litmus turns red

13

Hydrogen

Lit splint produces squeeky pop

14

HCl

Steamy fumes blue litmus goes red, white smoke produced with NH3, white ppt produced when bubbled through AgNO3