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S1 > Awesome Acids > Flashcards

Awesome Acids Flashcards

1
Q

What does the pH scale measure?

A

The acidity or alkalinity of a substance

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2
Q

What is the number range of the pH scale?

A

1-14

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3
Q

What is the colour range for the pH scale?

A
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4
Q

What is the pH range for acids?

A

Less than 7

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5
Q

Do strong acids have a higher or lower pH than weak acids?

A

Lower

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6
Q

What is the pH range for alkalis?

A

Greater than 7

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7
Q

Do strong alkalis have a higher or lower pH than weak alkalis?

A

Higher

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8
Q

What is the pH value for neutral solutions?

A

7

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9
Q

True or false? The pH scale can only measure in whole numbers.

A

False

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10
Q

What is an indicator?

A

A substance that changes colour to identify pH values

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11
Q

How do we test a substance for pH using universal indicator?

A

​1. Substance must be in aqueous solution

2. Place a few drops of indicator solution into a small volume of the substance.

3. Compare and match the colour to appropriate colour chart

4. Read off correct pH value for that colour

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12
Q

What are some natural sources of indicators?

A

Plants, fruits and flowers

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13
Q

How do you make red cabbage indicator?

A
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14
Q

What is the colour scale for red cabbage indicator?

A
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15
Q

Name 3 indicators used in the lab

A

pH paper universal indicator red cabbage indicator

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16
Q

What happens when we dilute a substance using water?

A

The number of particles per ml decreases

17
Q

What particle makes solutions acidic?

A

The H particle

18
Q

What particle makes solutions alkaline

A

The OH particle

19
Q

What is concentration?

A
20
Q

What happens to the pH of acids when we dilute them with water?

A

The pH increases towards 7

21
Q

What happens to the pH of alkalis when we duilute them?

A

The pH decreases towards 7

22
Q

How does diluting an acid increase pH?

A

The concentration of acidic (H) particles decreases.

23
Q

By what factor do we have to dilute acids to increase the pH by approx 1?

A

By a factor of 10

24
Q

What is meant by neutralising an acid?

A

Bringing the pH up to 7

25
Q

What are the products of neutralising acids with alkalis?

A

Water

26
Q

How can we separate the 2 products?

A

Evaporation

27
Q

What is an advantage of using phenolphthalein indicator when neutralising?

A

Immediate colour change when neutral

28
Q

What gas is produced when metals react with acids?

A

Hydrogen

The hydrogen particles in the acid turn into hydrogen gas

29
Q

How can we compare the reactivity of metals by placing them in acid?

A
30
Q

What is the test for hydrogen?

A

Burns with a “pop”

S1 (15 decks)

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