Reagent questions Flashcards
What is the reagent and observation to distinguish between NaCl and BaCl2
Reagent - H2SO4
Obs:
NaCl - No visible change
BaCl2 - White ppt formed
What is the reagent and observation to distinguish between NaCl and NaCO3
Reagent: H2SO4
Obs
Nacl - No visible change
NaCo3 - Effervescence
A solution of sodium chlorate(l) was added to a colourless solution of potassium
iodide.
Suggest what is observed.
Goes brown (or shades of brown)
Due to iodine
Because I− oxidised
What is the white ppt formed when a mixture of anhydrous barium
chloride and anhydrous magnesium chloride when added to sulfuric acid
BaSO4
What group 2 metal ion forms a white ppt with sulfuric acid
Ba2+
What negative ion forms a white ppt with magnesium nitrate
OH-
What is observed when dilute aqueous sodium hydroxide is added to magnesium chloride and barium chloride
MgCl2 - White ppt
BaCl2 - No visible change
Which ion forms a white ppt when H2SO4 is added
Ba2+
Write the ionic equation for the formation of a white ppt when Ba2+ ions react with H2SO4
Ba2+ + SO42- —> BaSO4
What is the test to distinguish between Cl- and Br- ions
Add dilute ammonia solution
If the ppt dissolves then Cl- ions present
If precipitate doesn’t dissolve then Br- ions present
Describe a series of tests that the student can use to show that solution C contains
ammonium sulfate
Warm with NaOH
Damp red litmus paper at the mouth of tube turns blue
Add BaCl2
White ppt formed
