9.2a - Determination of pH (Leaving Cert Chemistry): Flashcards
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pH scale range
pH scale range
0 (acidic) to 14 (basic)
pH value of highly acidic substances
pH value of highly acidic substances
0
pH value of highly basic substances
pH value of highly basic substances
14
pH value indicating neutral water
pH value indicating neutral water
7
Three methods to determine pH of water
Three methods to determine pH of water
pH meter, pH paper, universal indicator solution
How many drops of universal indicator per sample?
How many drops of universal indicator per sample?
2-3 drops
Required step before using pH meter
Required step before using pH meter
Calibrate using buffer solutions
What solution is used to rinse the pH probe?
What solution is used to rinse the pH probe?
Distilled water
Why rinse pH probe between samples?
Why rinse pH probe between samples?
Prevents contamination between samples
How limestone causes high pH in water
How limestone causes high pH in water
Dissolves calcium carbonate, raising pH
How algae cause high pH in water
How algae cause high pH in water
Photosynthesis consumes , increasing pH
How organic matter causes low pH
How organic matter causes low pH
Decomposes to form acidic substances
Industrial cause of low pH in water
Industrial cause of low pH in water
Industrial pollutants
Environmental impact of extreme pH values
Environmental impact of extreme pH values
Harms aquatic life, affects biological processes