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GCSE Chemistry > Acid & Bases Y9 > Flashcards

Acid & Bases Y9 Flashcards

1
Q

What is the pH scale?

A

A measure of how acidic or alkaline a solution is

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2
Q

What numbers do the pH scale range from?

A

0-14

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3
Q

What numbers on the pH scale are considered a strong acid?

A

0-3

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4
Q

What numbers on the pH scale are considered a weak acid?

A

4-6

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5
Q

What numbers on the pH scale are considered a weak alkali?

A

8-10

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6
Q

What numbers on the pH scale are considered a strong alkali?

A

11-14

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7
Q

What pH is neutral?

A

7

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8
Q

What pH is water?

A

7

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9
Q

Acids have a pH less than…

A

7

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10
Q

Bases have a pH more than…

A

7

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11
Q

What are some examples of acids?

A

Hydrochloric acid, Sulphuric acid, Nitric Acid, Ethanol

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12
Q

What are some examples of bases?

A

Metal oxides, metal hydroxides

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13
Q

What are alkalis?

A

Bases that are dissolved in water

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14
Q

What are some examples of alkalis?

A

Sodium hydroxide, potassium hydroxide

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15
Q

What are some indicators that we can use? (List 5)

A

Red litmus paper
Blue litmus paper
Phenolphthalein solution
Methyl orange solution
Universal indicator solution

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16
Q

What colour does red litmus solution turn in hydrochloric acid?

A

Red

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17
Q

What colour does blue litmus solution turn in hydrochloric acid?

A

Red

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18
Q

What colour does phenolphthalein solution turn in hydrochloric acid?

A

Colourless

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19
Q

What colour does methyl orange solution turn in hydrochloric acid?

A

Red

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20
Q

What colour does universal indicator solution turn in hydrochloric acid?

A

Red

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21
Q

What colour does red litmus solution turn in a neutral solution (water)?

A

Red

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22
Q

What colour does blue litmus solution turn in a neutral solution (water)?

A

Blue/purple

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23
Q

What colour does phenolphthalein solution turn in a neutral solution (water)?

A

Colourless

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24
Q

What colour does methyl orange solution turn in a neutral solution (water)?

25
Q

What colour does universal indicator solution turn in a neutral solution (water)?

26
Q

What colour does red litmus solution turn in sodium hydroxide solution?

27
Q

What colour does blue litmus solution turn in sodium hydroxide solution?

28
Q

What colour does phenolphthalein solution turn in sodium hydroxide solution?

A

Bright pink

29
Q

What colour does methyl orange solution turn in sodium hydroxide solution?

30
Q

What colour does universal indicator solution turn in sodium hydroxide solution?

31
Q

When would it be more suitable to use a paper indicator instead of a liquid indicator?

A

When testing gases.

32
Q

What colour does litmus turn in strongly acidic conditions?

33
Q

What colour does methyl orange turn in strongly acidic conditions?

34
Q

What colour does phenolphthalein turn in strongly acidic conditions?

A

Colourless

35
Q

What colour does litmus turn in strongly alkaline conditions?

36
Q

What colour does methyl orange turn in strongly alkaline conditions?

37
Q

What colour does phenolphthalein turn in strongly alkaline conditions?

A

Bright pink

38
Q

What is the colour of thymol blue at low pH values?

39
Q

What is the colour of methyl red at low pH values?

40
Q

What is the colour of bromothymol blue at low pH values?

41
Q

What is the colour of phenolphthalein at low pH values?

A

Colourless

42
Q

What is the pH range over which thymol blue changes colour?

43
Q

What is the pH range over which methyl red changes colour?

44
Q

What is the pH range over which bromothymol blue changes colour?

45
Q

What is the pH range over which phenolphthalein changes colour?

46
Q

What is the colour of thymol blue at high pH values?

47
Q

What is the colour of methyl red at high pH values?

48
Q

What is the colour of bromothymol blue at high pH values?

49
Q

What is the colour of phenolphthalein at high pH values?

50
Q

At pH 4 given that thymol blue is red: methyl red is red: bromothymol blue is yellow: and phenolphthalein is colourless what is the predicted colour of the mixed indicator?

51
Q

At pH 5 given that thymol blue is red: methyl red is red: bromothymol blue is yellow: and phenolphthalein is colourless what is the predicted colour of the mixed indicator?

52
Q

At pH 7 given that thymol blue is red: methyl red is yellow: bromothymol blue is blue: and phenolphthalein is colourless what is the predicted colour of the mixed indicator?

53
Q

At pH 8 given that thymol blue is red: methyl red is yellow: bromothymol blue is blue: and phenolphthalein is pink what is the predicted colour of the mixed indicator?

54
Q

At pH 10 given that thymol blue is yellow: methyl red is yellow: bromothymol blue is blue: and phenolphthalein is pink what is the predicted colour of the mixed indicator?

55
Q

What is neutralisation?

A

The reaction between and acid and a base, where both the acid and base are neutralised and water is formed

56
Q

What is an acid in an aqueous solution a source of?

A

Hydrogen ions

57
Q

What is an alkali in an aqueous solution a source of?

A

Hydroxide ions

58
Q

How is ammonia an alkali?

A

It is a source of hydroxide ions in an aqueous solution

GCSE Chemistry (10 decks)

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