Water Testing Flashcards
What is quantitative testing?
Quantitative analysis measures the amount of each substance present in a sample
What is qualitative testing?
Qualitative analysis investigates the types of substance present in a sample
What are flame tests used to detect?
Certain metal cations
What is the flame test for sodium?
Yellow
What is the flame test for potassium?
Lilac
What is the flame test for calcium?
Red
What is the flame test for copper?
Green/blue
How would you carry out tests for metal cations using sodium hydroxide solution?
First dissolve the sample in water, then add a few drops of sodium hydroxide solution. Many metal cations in solution form insoluble precipitates when this is done.
What is the colour of the hydroxide precipitate for the metal cation aluminium?
White
What is the colour of the hydroxide precipitate for the metal cation calcium?
White
What is the colour of the hydroxide precipitate for the metal cation copper?
Pale blue
What is the colour of the hydroxide precipitate for the metal cation iron (II)?
Green
What is the colour of the hydroxide precipitate for the metal cation iron (III)?
Brown
