Water Analysis Part 7 Flashcards
What do halides form insoluble compounds with?
The silver ion
What do carbonates react with?
Acids
What is limewater used to indicate the presence of?
Carbon dioxide
How can sulphate ions be identified by?
Adding barium chloride solution
How can nitrate ions be identified by?
Heating the solution with aluminium powder and sodium hydroxide
What will hydroxide ions react with and what do they do to litmus paper?
Ammonium chloride and turn red litmus paper blue
How can phosphate ions be identified by?
Mixing with ammonium molybdate solution
What is the result of a flame test for barium?
Pale green/yellow
What is the result of a flame test for calcium?
Brick red
What is the result of a flame test for copper?
Green/blue
What is the result of a flame test for lithium?
Red
What is the result of a flame test for sodium?
Orange/yellow
What is the result of a flame test for potassium?
Lilac
What is the colour of an iron(ii) precipitate?
Yellow
What is the colour of an iron (iii) precipitate?
Orange
What is the colour of a copper precipitate?
Blue
What is the colour of a silver precipitate?
Brown
What is the colour of a barium precipitate?
Cloudy white
What is the colour of a lead precipitate?
Milky white
What does iron (ii) form when mixed with sodium hydroxide?
Brown gelatinous precipitate
What does silver form when mixed with hydrochloric acid?
White precipitate
What does copper form when mixed with ammonia?
Blue gelatinous precipitate
What does ammonium form when mixed with a hydroxide or a litmus test?
Ammonia gas smell, turns litmus blue
What does iron (iii) form when mixed with KSCN or sodium hydroxide?
Blood red precipitate in KSCN, dark orange precipitate in sodium hydroxide
