Acids And Bases

Question 1

What is the pH of acid

Answer 1

0 - 6.9

Question 2

What is the pH of alkaline

Answer 2

7.1- 14

Question 3

pH of neutral

Answer 3

7

Question 4

3 ways a pH can be measured

Answer 4

pH meter , pH paper , indicator solution

Question 5

What ion do all acids contain

Answer 5

Hydrogen ( H+)

Question 6

What makes acids acids

Answer 6

Having more H+ ions than OH-

Question 7

What ion do all alkalis contain

Answer 7

Hydroxide ( OH- )

Question 8

What makes alkalis alkaline

Answer 8

Having more OH- ions than H+ ions

Question 9

What ion do alkalis have more of

Answer 9

They have more OH- ( hydroxide ) than H+ ( hydrogen )ions

Question 10

What ion does acids have more of

Answer 10

They have more H+ ( hydrogen )than OH- (hydroxide )ions

Question 11

What else determines the pH of a solution

Answer 11

The concentration of hydrogen ions in a solution

Question 12

What determines a concentrated acid/alkali solution

Answer 12

A high number of H+ or OH- ions

Question 13

What determines a dilute acid/alkali solution

Answer 13

Low number of H+ or OH- ions

Question 14

What does it mean to dissociate

Answer 14

To break up

Question 15

What determines a strong acid/alkali

Answer 15

Fully dissociates into ions when dissolved

Question 16

What determines a weak acid/alkali

Answer 16

Partially dissociate into ions when dissolved into water

Question 17

What is acids formula written as showing

Answer 17

Ionic charges

Question 18

What is alkaline formula written as showing

Answer 18

Ionic charges

Question 19

What do all acids formulas contain and why

Answer 19

Hydrogen ions because they break up into hydrogen ions when dissolved in water

Question 20

What do all alkalines formula contain and why

Answer 20

hydroxide ions because they break up into hydroxide ions when dissolved in water

Question 21

Why do acids and alkalis conduct electricity.

Answer 21

because of the presence of ions that are free to carry charge in a solution

Question 22

What makes acids and alkalis conduct electricity more

Answer 22

The more concentrated the solution, the more electricity it can produce

Question 23

What is better at conducting alkali or acid and why

Answer 23

Acids due to the hydrogen ions being so small in size

Question 24

Does water conduct and how does it conduct

Answer 24

Pure water does not conduct , it is the minerals dissolved in it that allows it to conduct

Question 25

Do water molecules dissociate and can it conduct from this

Answer 25

Some water molecules dissociate spontaneously, but not enough to allow water to conduct

Question 26

What is ph

Answer 26

The pH measures the concentration of H+ ions in a substance. The lower the pH, the more acidic it is

Question 27

What happens when a solution of acid or alkali is diluted by a factor of 10

Answer 27

The pH changes by 1

Question 28

What happens when an acid is diluted

Answer 28

the concentration of H+ ions decreases and the pH increases towards 7.

Question 29

What happens when an alkali is diluted

Answer 29

the concentration of OH- ions decreases and the pH also decreases towards 7

Question 30

What do non metal oxides form

Answer 30

Acidic solutions

Question 31

What do soluble metal oxides form

Answer 31

Alkaline solutions

Question 32

What form are oxides

Answer 32

Usually powders however they can be acid or alkali when dissolved into water

Question 33

How are oxides formed

Answer 33

when an element reacts with oxygen in the air (This usually happens when we burn something, although not always)

Question 34

Example of oxides formed

Answer 34

Iron + oxygen = Iron oxide (rust) Sulfur + oxygen = Sulfur dioxide

Question 35

What did we discover when blowing into a straw into a beaker filled with boiled water and universal indication

Answer 35

Carbon dioxide is a non metal oxide which can dissolve in water to form carbonic acid ( This causes the pH of water to decrease and can be seen as the indicator changes from green to orang)

Question 36

What happens when you add a non metal oxide to water

Answer 36

You form an acidic solution.

Question 37

What happens when you add soluble metal oxides to water

Answer 37

An alkali solution is formed

Question 38

What is formed from magnesium being burned in the air ( + what colour does it make pH paper go )

Answer 38

A magnesium oxide is formed and the damp pH paper is turned into a blue/purple

Question 39

Only the soluble metal oxides can form an alkali , what effect will insoluble metals it have on the pH while dissolved in water

Answer 39

it will have no effect on the pH of water