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Ch9 Acids And Alkalis > 9..2 Indicators And PH Scale > Flashcards

9..2 Indicators And PH Scale Flashcards

1
Q

What to use to show the presence of acids/alkaline (distinguish)

A

Indicators

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2
Q

What are 2 kinds of indicators that DISTINGUISH acids/alkaline

A

Natural indicators and litmus

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3
Q

How does red cabbage extract work as a natural indicator

A

Contains pigments that change colour in the presence of an acid/alkaline

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4
Q

What colour is red cabbage extract in acidic/alkaline solutions

A

Pink in acidic
Green in alkaline

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5
Q

What’s litmus

A

A mixture of pigments extracted fr lichen

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6
Q

How does litmus distinguish acids/alkaline

A

Shows diff colours in acidic/alkaline conditions

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7
Q

What forms are litmus available in

A

Solution and paper

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8
Q

What colours do litmus paper come in

A

Red, blue

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9
Q

How to prepare litmus paper

A

Soak strips of filter paper in litmus solution and dry before use

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10
Q

What colour litmus are used to test acids/alkaline

A

Acid: blue turns red
Alkaline: red turns blue

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11
Q

What do we use to show HOW acidic/alkaline substance is

A

Universal indicator

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12
Q

How does universal indicator work

A

diff colours depending on degree of acidity/alkalinity

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13
Q

What is the paper form of universal indicator

A

PH paper

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14
Q

Explain the PH scale

A

Acidic 0-6, lower —> more acidic
Neutral 7
Alkaline 8-14 lower —> less alkaline

(More acid Less acid less alkaline More alkaline)

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15
Q

Arrange these from most to least acidic
Cola, orange juice, Black coffee, sulphuric acid

A

Sulphuric acid, cola, orange juice, black coffee

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16
Q

Arrange these from most to least alkaline
Glass cleaner, limewater, detergent, drain cleaner

A

Drain cleaner, limewater, glass cleaner, detergent

17
Q

Universal indicator only gives a rough measurement. What are more accurate ways to measure pH value?

A

PH meter
-probe connected to digital display

PH sensor connected w data-logger
-record,analyse, monitor changes

18
Q

Sum up- list the 2 indicators that DISTINGUISH and 4 indicators that show HOW acidic/alkaline

A

DISTINGUISH
1. natural indicators
2. Litmus

HOW
1. Universal indicator
2. PH paper
3. PH meter
4. PH sensor connected w data logger

19
Q

Advantages of pH meter

A

Accurate, reuse, deep colour

20
Q

Disadvantages of pH meter

A

Expensive, less convenient

Ch9 Acids And Alkalis (5 decks)

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