2 (f) Acids, alkalis and titrations Flashcards

1
Q

Different Indicators

A
  • Litmus
  • Phenolphthalein
  • Methyl Orange
  • Universal Indicator
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2
Q

Litmus

A

Acidic: Red
Alkaline: Blue

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3
Q

Phenolpthalein

A

Acidic: Colourless
Alkaline: Pink

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4
Q

Methyl Orange

A

Acidic: Red
Alkaline: Yellow

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5
Q

Universal Indicator

A

Rainbow
Goes from red to purple as pH increases

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6
Q

pH scale

A

a measure of how acidic/alkaline a solution is

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7
Q

pH scale values

A
  • 0-3 = strongly acidic
  • 4-6 = weakly acidic
  • 7 = neutral
  • 8-10 = weakly alkaline
  • 11-14 = strongly alkaline
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8
Q

What can alkalis do?

A

Neutralise acids

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9
Q

How to carry out an acid/alkali titration

A
  1. Measure acid using pipette and pipette filler
  2. Transfer to conical flask
  3. Fill burette with alkali. Record initial reading of burette
  4. Add a few drops of phenolpthalein indicator to conical flask
  5. Add sodium hydroxide until colour change
  6. Take final reading on burette
  7. Work out alkali added: Final reading - initial reading
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10
Q

Ways to make the titration accurate

A
  • Rinse burette with alkali to remove impurities
  • Rinse pipette with acid to remove impurities
  • Swirl conical flask to mix
  • Repeat and create an average with concordant results = 0.2cm3
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