Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

chemistry > bases, acids and salts > Flashcards

bases, acids and salts Flashcards

1
Q

what colour is phenolphthalein indicator in an acid

A

colourless

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what colour is phenolphthalein indicator in an alkali

A

pink

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what colour is phenolphthalein indicator in a neutral solution

A

colourless

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what colour is red litmus in an acid

A

red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what colour is red litmus in an alkali

A

blue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what colour is red litmus in a neutral solution

A

red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what colour is blue litmus in an acid

A

red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what colour is blue litmus in an alkali

A

blue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what colour is blue litmus in a neutral solution

A

blue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what colour is methyl orange in an acid

A

red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what colour is methyl orange in an alkali

A

yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what colour is methyl orange in a neutral solution

A

orange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ph and colour of a strong acid

A

0-2
red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

ph and colour of weak acids

A

3-6
3-4 orange
5-6 yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

ph and colour of neutral

A

7
green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

ph and colour of a weak alkali

A

8-11
8-9 green-blue
10-11 blue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

ph and colour of a strong alkali

A

12-14
12 dark blue
13-14 purple

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what can be used to indicate the strength of solutions

A

ph meter
universal indicator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

the higher the concentration of hydrogen ions the _________________________

A

lower the ph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what type of ion is in acids

A

hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

acids dissolve in water to produce

A

hydrogen ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

alkalis dissolve in water to produce

A

hydroxide ions

23
Q

when are alkalis formed

A

when metal oxides or hydroxide dissolve in water

24
Q

definition of a base

A

a metal oxide or metal hydroxide neutralises an acid to produce a salt and water

25
Q

strong acids and alkalis __________________________ in water

A

completely ionise

26
Q

weak acids and alkalis __________________________________ in water

A

partially ionise

27
Q

equations of neutralisation

A

H+(aq) + OH-(aq) -> H2O (l)

28
Q

are neutralisation reactions endothermic or exothermic

A

exothermic

29
Q

piece of equipment used to add acid in small amounts

30
Q

definition of a salt

A

a salt is formed when some or all of the hydrogen ions in an acid are replaced by metal ions or ammonium ions

31
Q

hydrochloric acid

32
Q

sulfuric acid

33
Q

nitric acid

34
Q

metal + acid

A

salt + hydrogen

35
Q

observation when a metal reacts with an acid

A
  • fizzing
  • metal disappears
  • heat is produced
36
Q

acid + base

A

salt + water

37
Q

observations when and acids reacts with a base

A
  • solid disappears
  • solution formed
38
Q

does the reaction between an oxide and acid produce heat

39
Q

acid + alkali

A

salt + water

40
Q

observations when and acid reacts with an alkali

A
  • heat produced
  • solution formed
41
Q

acid + carbonate

A

salt + water + carbon dioxide

42
Q

how can we detect carbon dioxide + colour change

A

lime water
colourless to milky

43
Q

observations when a acid and carbonate react together

A
  • solid disappears
  • solution formed
  • heat is produced
  • fizzing
44
Q

does the reaction between a hydrogencarbonate and acid produce heat

45
Q

acid + ammonium

A

ammonium salt

46
Q

what colour are copper salts usually in solution

47
Q

how to make copper sulfate crystals

A
  1. warm 30cm3 of sulfuric acid gently
  2. add small quantities of cupper(II) oxide and stir after each addition until no more reacts
  3. filter to remove unreacted copper(II) oxide
  4. evaporate half of the liquid
  5. leave to cool and crystallise slowly. dry between 2 pieces of filter paper
48
Q

making sodium chloride crystals

A
  1. measure out 25.0cm3 of hydrochloric acid into a conical flask
  2. add 5 drops of phenolphthalein indicator
  3. add sodium hydroxide from a burette until the colour changes from colourless to pink
  4. the solution is now neutral but the indicator must be removed. add a large spatula of charcoal
  5. heat the flask gently and swirl it for 5 minutes
  6. filter the solution into an evaporating basin
  7. evaporate half of the filtrate and allow to cool and crystallise slowly
  8. filter the crystals and dry between two pieces of filter paper
49
Q

making copper sulfate crystals

A
  1. measure out 25 cm3 of sulfuric acid into a small beaker
  2. add the carbonate to the acid slowly and in small portions. when there is no more fizzing the acid has been neutralised
  3. filter the liquid
  4. evaporate half of the liquid and allow to cool and crystallise slowly
  5. filter the crystals and dry between 2 pieces of filter paper
50
Q

what colour is copper carbonate

51
Q

what is used to distinguish the ph of strong acids

52
Q

what is the unit of concentration

53
Q

what is used to measure a)25cm3 of a liquid b)25.0 cm3 of liquid

A

a) measuring cylinder
b) pipette/burette

54
Q

what colour is copper (II) oxide

chemistry (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions