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Analytical Chemistry Lecture > Titration and Indicators > Flashcards

Titration and Indicators Flashcards

1
Q

What are the types of Litmus Paper

A

Synthetic and Natural

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2
Q

paper that has been dipped in a substance that will undergo a color change when it is dipped in either an acid or base

A

Litmus paper

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3
Q

is called an indicator because it is used to indicate whether the solution is an acid or base

A

Litmus paper

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4
Q

If the red litmus paper turns blue

A

solution is basic (ph>7)

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5
Q

if the blue litmus paper turns red

A

solution is acidic (ph<7)

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6
Q

substance that changes color at a specific pH and is used to indicate the pH of the solution

A

indicator

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7
Q

active ingredient in indicator

A

anthrocyanin

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8
Q

is a common garden plant with flowers that may come in many colors depending on the pH of the soil

A

hydrangea

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9
Q

blue hydrangea flowers means

A

soil is acidic

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10
Q

creamy white hydrangea flowers means

A

soil is neutral

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11
Q

pink hydrangeo flowers means

A

soil is basic

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12
Q

indicator that is produced from a substance that is naturally occurring or is itself a naturally occurring substance

A

natural indicator

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13
Q

examples of natural indicator

A

red beets
blueberries
cranberries

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14
Q

What is the active ingredient found in natural indicator?

A

anthrocyanin

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15
Q

compounds created in a chemistry lab rather than compounds found in nature

A

synthetic indicators

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16
Q

True or False: both naturally occurring indicators and synthetic indicators are weak organic acids or bases

A

true

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17
Q

What is a common synthetic indicator used in most chemistry laboratories

A

Phenolphthalein

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18
Q

indicator that changes color at pH of 8.2 whereas it is colorless before 8.2 and after it is pink

A

phenolphthalein

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19
Q

What is the color of Phenolphthalein before pH is 8.2?

A

colorless

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20
Q

What is the color of Phenolphthalein after pH is 8.2

A

pink

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21
Q

changes color from ph 3.2 to 4.4

A

methyl orange

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22
Q

color of methyl orange below 3.2

A

red

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23
Q

above 4.4 color of methyl orange

A

yellow

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24
Q

between 3.2 and 4.4 of methyl orange

A

orange

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25
Q

donates a proton

A

Bronsted-Lowry acid

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26
Q

accepts a proton

A

Bronsted-Lowry base

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27
Q

What are the requirements for a substance to function as an acid-base indicator?

A

substance must have an equilibrium affected by hydrogen ion concentration
two forms of compound on different sides of equilibrium must have different color

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28
Q

pH range of methyl violet

A

0.0 - 1.6

29
Q

ph range of thymol blue

A

1.2 - 2.8

30
Q

orange IV ph range

A

1.3 - 3.0

31
Q

methyl orange ph range

A

3.2 - 4.4

32
Q

bromphenol blue pH range

A

3.0 - 4.7

33
Q

congo red pH range

A

3.0 - 5.0

34
Q

bromocresol green pH range

A

3.8 - 5.4

35
Q

methyl red pH range

A

4.8 - 6.0

36
Q

litmus pH range

A

5.0 - 8.0

37
Q

chlorophenol red pH range

A

4.8 -6.2

38
Q

bromothymol blue pH range

A

6.0 - 7.6

39
Q

phenol red pH range

A

6.4 - 8.2

40
Q

thymol blue pH range

A

8.0 -9.6

40
Q

phenolphthalein pH range

A

8.2 - 10.0

41
Q

thymolphthalein pH range

A

9.4 - 10.6

42
Q

alizarin yellow R ph range

A

10.1 - 12.0

43
Q

Methyl blue pH range

A

10.6 - 13.4

44
Q

indigo carmine pH range

A

11.4 - 13.0

45
Q

color range of methyl violet

A

yellow-blue

46
Q

color range of thymol blue

A

red-yellow

47
Q

color range of orange IV

A

red-yellow

48
Q

color range of methyl orange

A

red-orange

49
Q

color range of bromphenol blue

A

orange/yellow-violet

50
Q

color range of congo redd

A

blue-red

51
Q

color range of bromocresol green

A

yellow-blue

52
Q

color range of methyl red

A

red-yellow

53
Q

color range of litmus

A

red-blue

54
Q

color range of chlorophenol red

A

yellow-red

55
Q

color range of bromothymol blue

A

yellow-blue

56
Q

color range of phenol red

A

yellow-red/violet

57
Q

color range of thymol blue

A

yellow-blue

58
Q

color range of phenolphthalein

A

colorless-pink

59
Q

color range of thymolphthalein

A

colorless-blue

60
Q

color range of alizarin yellow R

A

yellow-red

61
Q

color range of methyl blue

A

blue-pale violet

62
Q

color range of indigo carmine

A

blue-yellow

63
Q

solution that has a different color for each pH from 0-14

A

universal indicator

64
Q

produced by creadively mixing many of the individual indicators together so that a different color is achieved for each different pH

A

universal indicator

65
Q

substance that changes color at a specific pH and is used to indicate the pH of the solution

A

indicator

66
Q

produced from a substance that is naturally occurring or is itself a naturally occurring substance

A

natural indicator

67
Q

normally an organic weak acid or base with usually complicated structure

A

synthetic indicator

68
Q

solution that has a different color for each pH from 0-14

A

Universal indicator

Analytical Chemistry Lecture (2 decks)

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