Water Titration Flashcards
1
Q
Indicator for Edta
A
Eriochrome Black T
2
Q
What does Edta stand for
A
Ethylenediaminetetraacetic acid
3
Q
Colour Change of Eriochrome Black T
A
Red/wine to blue
4
Q
What pH buffer is needed for Eriochrome Black T
A
pH buffer 10
5
Q
Why was it important to avoid trapping air
bubbles in BOD titration
A
More oxygen would be dissolved
Inaccurate results
6
Q
What was added to the BOD
A
Concentrated manganese (II) sulfate
Concentrated alkaline potassium iodide
Concentrated sulfuric acid
7
Q
How is dissolved oxygen in water counted
A
Winkler Method
8
Q
What happened after the concentrated sulfuric acid was added to water
A
A precipitate is dissolved and the solution turns brown
9
Q
Indicator for BOD
A
Starch
10
Q
Colour Change for BOD
A
Red/brown to colourless
