acids

Question 1

what do acids produce in aqueous solutions

Answer 1

H⁺ ions

Question 2

what do alkalis produce in aqueous solutions

Answer 2

OH⁻ ions

Question 3

what is the pH scale

Answer 3

the pH scale (0-14) measures the acidity of alkalinity

Question 4

how can you measure the pH

Answer 4

using a universal indicator of a pH probe

Question 5

what pH is neutral

Answer 5

pH 7

Question 6

what pH is acidic

Answer 6

< pH 7

Question 7

what pH is alkaline

Answer 7

> pH 7

Question 8

phenolphthalein + alkali

Answer 8

pink

Question 9

phenolphthalein + acidic

Answer 9

colourless

Question 10

methyl orange + alkaline

Answer 10

yellow

Question 11

methyl orange + acidic

Answer 11

red

Question 12

litmus solution + alkaline

Answer 12

blue

Question 13

litmus solution + acidic

Answer 13

red

Question 14

blue litmus paper + acidic

Answer 14

red

Question 15

blue litmus paper + alkaline

Answer 15

stays blue

Question 16

red litmus paper + acidic

Answer 16

stays red

Question 17

red litmus paper + alkaline

Answer 17

blue

Question 18

what does the concentration of H⁺ ions mean in an acid solution

Answer 18

a higher concentration of H⁺ ions means that the solution is more acidic, thus having a lower pH

Question 19

what does the concentration of OH⁻ ions mean in an alkaline solution

Answer 19

a higher concentration of OH⁻ ions means the that solution is more alkaline, thus having a higher pH

Question 20

what happens when the pH decreases by one unit

Answer 20

the H⁺ concentration of the solution increases by a factor of 10

Question 21

what is strong and weak not the same as

Answer 21

concentrated and dilute

Question 22

what does concentrated and dilute refer to

Answer 22

concentrated and dilute refers to the amount of substance whereas

Question 23

what does strong and weak refer to

Answer 23

refers to the H⁺ ion concentration in aqueous solutions

Question 24

concentrated

Answer 24

larger amount of substance in a given volume of solution

Question 25

dilute

Answer 25

lesser amount of substance in a given volume of a solution

Question 26

what is dissociation

Answer 26

dissociation is where an acid breaks down to release H⁺ ions in solution

Question 27

what does a strong acid do in an aqueous solution

Answer 27

fully dissociates

Question 28

what does a weak acid do in an aqueous solution

Answer 28

partially dissociates

Question 29

acid + base → ?

Answer 29

acid + base → salt + water

Question 30

acid + metal → ?

Answer 30

acid + metal → salt + hydrogen gas

Question 31

acid + metal oxide → ?

Answer 31

acid + metal oxide → salt + water

Question 32

acid + metal carbonate → ?

Answer 32

acid + metal carbonate → salt + water + carbon dioxide

Question 33

why are metal oxides normally bases

Answer 33

because there are insoluble

Question 34

what is the test for hydrogen

Answer 34

use a burning splint held at the open end of a test tube of the gas. if there is hydrogen it creates a squeaky pop sound

Question 35

what is the test for carbon dioxide

Answer 35

bubble gas through the limewater (calcium hydroxide solution) and it will turn milky (cloudy) if it is carbon dioxide