Acids and bases Flashcards

1
Q

What is a pH scale?

A
  • Measure of how acidic or alkaline a solution is
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2
Q

Describe the pH scale.

A
  • Lower pH, more acidic
  • Higher pH, more alkaline
  • pH 7 is neutral
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3
Q

What dye can you use to measure the pH?

A
  • Universal indicator
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4
Q

How can you measure a pH electronically?

A
  • pH probe attached to pH meter, display numerical value
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5
Q

What do acids and bases do to each other?

A
  • Neutralise each other
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6
Q

What is an acid?

A
  • Substance that form aqueous solution less than pH 7

- Form H+ ions in water

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7
Q

What is a base?

A
  • Substance that react with acid, form salt
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8
Q

What is an alkali?

A
  • Substance that dissolves in water, form solution with pH greater than pH 7
  • Form OH- ions in water
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9
Q

Equation for acids and bases:

A
  • Neutralisation:

acid + base –> salt + water

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10
Q

Equation for acids and bases in terms of ions:

A

H+ (aq) + OH- (aq) –> H2O (l)

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11
Q

What is an aqueous solution?

A
  • Solution in which water is solvent
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12
Q

What is the pH of a neutralised product?

A
  • pH 7
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