C2F - pH & Salts Made Flashcards Preview

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Flashcards in C2F - pH & Salts Made Deck (24):
0

What colour does universal indicate turn when an acid is present ?

Red
Orange
Yellow

1

What colour would the UI turn when in water and why ?

Green because it's neutral

2

When UI turns purple or blue what thing is present ?

Alkali

3

Name an acid ?

Stomach acid

4

Name an alkali ?

Washing up liquid

5

What makes the dye in UI change colour ?

The pH of a substance

6

What can UI be used for ?

Estimating the pH of a substance

7

Some indicators can show a sudden colour change. Give an example ?

Litmus turns red in acid and blue in alkali's

8

How is Universal Indicator different to litmus ?

It shows a gradual colour change

9

If something is an acid what must it's pH be ?

Less than 7

10

What ions do acids form in water ?

H+

11

What is the pH determined by in an acid ?

The concentration of H+ ions

12

What would we call something with a pH greater than 7 ?

A base

13

An alkali is a base that is what in water ?

Soluble

14

What ions do alkali's form in water ?

OH-

15

What is the reaction between an acid and a base called ?

Neutralisation

16

What's the word equation for neutralisation ?

Acid + Base = Salt + Water

17

When an acid neutralises a base. What pH will the product be and why ?

7 because it's neutral

18

What are metal oxides and metal hydroxides ?

Bases

19

When you add an acid to a metal oxide or metal hydroxide what will it make every time ?

Salt & Water

20

Explain how the salts are named in a neutralisation reaction ?

The name of the acid is combined with the name of the metal oxide

21

What is the different product produced when we add acids and carbonates ?

Carbon dioxide

22

What equals water salt AND carbon dioxide ?

Acids and carbonates

23

Finish the equation
---- + Ammonia = -------- Salts

Acid
Ammonium