Reagent questions

Question 1

What is the reagent and observation to distinguish between NaCl and BaCl2

Answer 1

Reagent - H2SO4

Obs:
NaCl - No visible change
BaCl2 - White ppt formed

Question 2

What is the reagent and observation to distinguish between NaCl and NaCO3

Answer 2

Reagent: H2SO4

Obs
Nacl - No visible change
NaCo3 - Effervescence

Question 3

A solution of sodium chlorate(l) was added to a colourless solution of potassium
iodide.
Suggest what is observed.

Answer 3

Goes brown (or shades of brown)
Due to iodine
Because I− oxidised

Question 4

What is the white ppt formed when a mixture of anhydrous barium
chloride and anhydrous magnesium chloride when added to sulfuric acid

Answer 4

BaSO4

Question 5

What group 2 metal ion forms a white ppt with sulfuric acid

Answer 5

Ba2+

Question 6

What negative ion forms a white ppt with magnesium nitrate

Answer 6

OH-

Question 7

What is observed when dilute aqueous sodium hydroxide is added to magnesium chloride and barium chloride

Answer 7

MgCl2 - White ppt
BaCl2 - No visible change

Question 8

Which ion forms a white ppt when H2SO4 is added

Answer 8

Ba2+

Question 9

Write the ionic equation for the formation of a white ppt when Ba2+ ions react with H2SO4

Answer 9

Ba2+ + SO42- —> BaSO4

Question 10

What is the test to distinguish between Cl- and Br- ions

Answer 10

Add dilute ammonia solution
If the ppt dissolves then Cl- ions present
If precipitate doesn’t dissolve then Br- ions present

Question 11

Describe a series of tests that the student can use to show that solution C contains
ammonium sulfate

Answer 11

Warm with NaOH
Damp red litmus paper at the mouth of tube turns blue
Add BaCl2
White ppt formed