Acids and Bases Deck 1

Question 1

Define an acid

Answer 1

Proton Donor

Question 2

Define a base

Answer 2

Proton Acceptor

Question 3

Define a strong Acid

Answer 3

An acid (proton donor) which fully dissociates

Question 4

Define a weak Acid

Answer 4

An acid ( proton donor) which only partially dissociates

Question 5

Define pH

Answer 5

pH = -Log10[H+]

Question 6

[H+] =

Answer 6

[H+] = 10-pH

Question 7

Ionic Product of Water (Kw) =

Answer 7

Kw = [H+][OH-]

Question 8

When calculating the pH of a strong acid use:

Answer 8

pH = -Log10[H+]

Question 9

When calculating the pH of a strong base use:

Answer 9

Rearrange Kw = [H+][OH-] to get [OH-] then use pH = -Log10[H+]

Question 10

When calculating the pH of a weak acid use:

Answer 10

Ka = [H+]2/[HA] and rearrange to get [H+]
then use pH = -Log10[H+]

Question 11

Chemical equation for Hydrochloric Acid + Sodium

Answer 11

HCl(aq) + Na(s) –> NaCl(aq) + ½ H2(g)

Question 12

Chemical equation for Nitric Acid + Potassium Oxide

Answer 12

2HNO3 (aq) + K2O(s) –> 2KNO3 (aq) + H2O(l)

Question 13

Chemical equation for Phosphoric Acid + Sodium Hydroxide

Answer 13

H3PO4(aq) + 3NaOH(s) –> Na3PO4(aq (aq) + 3H2O(l)

Question 14

Chemical equation for Hydrochloric Acid + Calcium Oxide

Answer 14

2HCl (aq) + CuO(s) –> CuCl2 (aq) + H2O(l)

Question 15

Chemical equation for Sulfuric Acid + Sodium Carbonate

Answer 15

H2SO4(aq) + Na2CO3(s) –> Na2SO4(aq) + CO2(g) + H2O(l)

Question 16

A difference of 1 on the pH scale means

Answer 16

a 10x difference in [H+]

Question 17

pKa =

Answer 17

-Log10Ka

Question 18

Ka =

Answer 18

10-pKa

Question 19

The value of Kw will alter with temperature, explain why pure water is always neutral

Answer 19

because [H+] = [-OH] at all times.

Question 20

Formula for sulphuric acid

Answer 20

H2SO4

Question 21

Formula for nitric acid

Answer 21

HNO3

Question 22

Formula for phosphoric acid

Answer 22

H3PO4

Question 23

Formula for ethanoic acid

Answer 23

CH3COOH

Question 24

Formula for aluminium phosphate

Answer 24

AlPO4

Question 25

Formula for sodium ethanoate

Answer 25

CH3COONa

Question 26

Formula for lead (II) nitrate

Answer 26

Pb(NO3)2

Question 27

Formula for potassium sulphate

Answer 27

K2SO4

Question 28

Formula for magnesium chloride

Answer 28

MgCl2

Question 29

Explain how to chose a suitable indicator for a titration

Answer 29

A SUITABLE INDIATOR CHANGES COLOUR SOMEWHERE ON THE VERTICAL SECTION OF A pH TITRATION CURVE

Question 30

What does the vertical section of a titration curve show?

Answer 30

This indicates what the average titre would be which can be used in a calculation. The midpoint of this vertical section is the equivalence point.