13A –Assignment
, a
Ka of my practical=3.06 x 10^-5
This should be compared to ethanoic acid ka which is 1.8 x 10^-5
This means ours was close enough, which shows it would be accurate and reliable.
Ph indicators and the color they change to
- Litmus paper - Red: Acidic (pH < 7) Blue: Basic (pH > 7)
- Phenolphthalein: Colorless: Acidic (pH < 4.8) Pink/Red: Basic (pH > 9.4
- Methyl Orange: Red: Acidic (pH < 3.4) Yellow: Basic (pH > 4.4)
- Bromothymol Blue: Yellow: Acidic (pH < 6.0) Green: Neutral (pH ≈ 7.0) Blue:
Basic (pH > 7.6)
- Universal Indicator: Red: Strongly acidic (pH ≈ 1)
- Orange/Yellow: Mildly acidic (pH ≈ 4-6)
- Green: Neutral (pH ≈ 7)
- Blue/Indigo: Basic (pH ≈ 9-11)
- Purple: Strongly basic (pH ≈ 12-14)
Distinction indicators ph. Auto titrator
costs Very cheap High cost – can be Expensive around
expensive as the £6000
replacements might
be required as well
Skills required Basic skills required Moderate to high Moderate to –very
skills-technical set high skills needed
up and data
analysis is required
Accuracy Moderate accuracy High precise High (precise pH
of the clarity of the measurement so measurements,
, a
Ka of my practical=3.06 x 10^-5
This should be compared to ethanoic acid ka which is 1.8 x 10^-5
This means ours was close enough, which shows it would be accurate and reliable.
Ph indicators and the color they change to
- Litmus paper - Red: Acidic (pH < 7) Blue: Basic (pH > 7)
- Phenolphthalein: Colorless: Acidic (pH < 4.8) Pink/Red: Basic (pH > 9.4
- Methyl Orange: Red: Acidic (pH < 3.4) Yellow: Basic (pH > 4.4)
- Bromothymol Blue: Yellow: Acidic (pH < 6.0) Green: Neutral (pH ≈ 7.0) Blue:
Basic (pH > 7.6)
- Universal Indicator: Red: Strongly acidic (pH ≈ 1)
- Orange/Yellow: Mildly acidic (pH ≈ 4-6)
- Green: Neutral (pH ≈ 7)
- Blue/Indigo: Basic (pH ≈ 9-11)
- Purple: Strongly basic (pH ≈ 12-14)
Distinction indicators ph. Auto titrator
costs Very cheap High cost – can be Expensive around
expensive as the £6000
replacements might
be required as well
Skills required Basic skills required Moderate to high Moderate to –very
skills-technical set high skills needed
up and data
analysis is required
Accuracy Moderate accuracy High precise High (precise pH
of the clarity of the measurement so measurements,
