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Flashcards in Awesome Acids Deck (30)
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1

What does the pH scale measure?

The acidity or alkalinity of a substance

2

What is the number range of the pH scale?

1-14

3

What is the colour range for the pH scale?

4

What is the pH range for acids?

Less than 7

5

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

Lower

6

What is the pH range for alkalis?

Greater than 7

7

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

Higher

8

What is the pH value for neutral solutions?

7

9

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

False

10

What is an indicator?

A substance that changes colour to identify pH values

11

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

​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

12

What are some natural sources of indicators?

Plants, fruits and flowers

13

 

How do you make red cabbage indicator?

14

What is the colour scale for red cabbage indicator?

15

Name 3 indicators used in the lab

pH paper universal indicator red cabbage indicator

16

What happens when we dilute a substance using water?

The number of particles per ml decreases

17

What particle makes solutions acidic?

The H particle

18

What particle makes solutions alkaline

The OH particle

19

What is concentration?

20

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

The pH increases towards 7

21

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

The pH decreases towards 7

22

How does diluting an acid increase pH?

The concentration of acidic (H) particles decreases.

23

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

By a factor of 10

24

What is meant by neutralising an acid?

Bringing the pH up to 7

25

What are the products of neutralising acids with alkalis?

Water

 

 

26

How can we separate the 2 products?

Evaporation

27

What is an advantage of using phenolphthalein indicator when neutralising?

Immediate colour change when neutral

28

What gas is produced when metals react with acids?

Hydrogen

 

The hydrogen particles in the acid turn into hydrogen gas

29

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

30

What is the test for hydrogen?

Burns with a "pop"