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Chemistry > 3.4.1 pH and Indicators > Flashcards

3.4.1 pH and Indicators Flashcards

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1
Q

What is the pH scale?

A

The pH scale is used to describe how acidic or alkaline a solution is.

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2
Q

What do the pH values mean?

A

pH < 7 is acidic
pH = 7 is neutral
pH > 7 is alkaline
Acids and alkalis can be stronger or weaker. It depends how far away from pH 7 it is.

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3
Q

What does an indicator do?

A

An indicator is a substance that changes colour to tell you about the pH of a solution.

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4
Q

What colour does methyl orange go in acid?

A

Red

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5
Q

What colour does methyl orange go in a neutral solution?

A

Yellow

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6
Q

What colour does methyl orange go in an alkali?

A

Yellow

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7
Q

What colour does phenolphthalein go in acid?

A

Colourless

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8
Q

What colour does phenolphthalein go in a neutral solution?

A

Colourless

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9
Q

What colour does phenolphthalein go in an alkali?

A

Pink

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10
Q

What colour does red litmus go in acid?

A

Red

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11
Q

What colour does red litmus go in a neutral solution?

A

Red

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12
Q

What colour does red litmus go in an alkali?

A

Blue

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13
Q

What colour does blue litmus go in acid?

A

Red

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14
Q

What colour does blue litmus go in a neutral solution?

A

Blue

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15
Q

What colour does blue litmus go in an alkali?

A

Blue

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16
Q

What colour does Universal Indicator go in a solution with pH 0-2?

A

Red

17
Q

What colour does Universal Indicator go in a solution with pH 3-4?

A

Orange

18
Q

What colour does Universal Indicator go in a solution with pH 5-6?

A

Yellow

19
Q

What colour does Universal Indicator go in a solution with pH 7?

A

Green

20
Q

What colour does Universal Indicator go in a solution with pH 8-10?

A

Light Blue

21
Q

What colour does Universal Indicator go in a solution with pH 11-13?

A

Dark Blue

22
Q

What colour does Universal Indicator go in a solution with pH 14?

A

Purple

Chemistry (51 decks)

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