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CHEMISTRY GCSE (Edexcel) > 3.01 Acids and bases > Flashcards

3.01 Acids and bases Flashcards

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1
Q

What is the range of the pH scale?

A

0 to 14

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2
Q

What is pH a measure of?

A

How acidic or alkaline a solution is

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3
Q

Give the pH, or pH range, of a neutral, acidic and alkaline solution.

A

Neutral = 7
Acidic <7 to 0
Alkaline >7 to 14

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4
Q

Give an example of a neutral substance

A

Pure water

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5
Q

What ions do acids contain?

A

H+ (hydrogen ion)

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6
Q

What ions do alkalis contain?

A

OH- (hydroxide ion)

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7
Q

What is a base?

A

A substance which reacts with an acid to produce salt and water

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8
Q

What is an alkali?

A

A base that is solubel in water

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9
Q

What is an acid?

A

A substance that releases H+ ions when in aqueous solution

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10
Q

As the concentration of H+ ions increases, does a solution become more or less acidic?

A

More acidic with more H+ ions

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11
Q

As the concentration of OH- ions increases, does a solution become more or less alkaline?

A

More alkaline with more OH- ions

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12
Q

What is an indicator?

A

A dye that changes colour depending on the pH

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13
Q

What colours are shown by universal indicator when the pH is (1) red, (2) green, (3) purple?

A

Red = acidic
Green = neutral
Purple = alkaline

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14
Q

What colour does universal indicator go when a solution is (1) acidic; (2) alkaline; and (3) neutral?

A

Acid = red
Neutral = green
Alkaline = purple

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15
Q

What colour does litmus go when a solution is (1) acidic; (2) alkaline; and (3) neutral?

A

Acid = red
Neutral = purple
Alkaline = blue

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16
Q

What colour does methyl orange go when a solution is (1) acidic; (2) alkaline; and (3) neutral?

A

Acid = red
Neutral = yellow
Alkaline = yellow

17
Q

What colour does phenolphthalein go when a solution is (1) acidic; (2) alkaline; and (3) neutral?

A

Acid = colourless
Neutral = colourless
Alkaline = pink

18
Q

Describe the relationship between the concentration of H+ and OH- ions and the pH of a solution

A

More acidic with more H+ ions
More alkaline with more OH- ions

19
Q

A base reacts with hydrocholric acid to produce a salt and what?

A

Water

CHEMISTRY GCSE (Edexcel) (9 decks)

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