2.1.4 Acids

Question 1

Acids release […] ions in aqueous solution

Answer 1

H+

Question 2

Alkalis release […] ions in aqueous solution

Answer 2

OH-

Question 3

What does a strong acid do

Answer 3

• fully ionises
• releases all of its H atoms into the solution as H+ ions
• completely dissociates in aq solution

Question 4

What do weak acids do

Answer 4

Only partially dissociate in aq solution (only a small proportion of available H atoms are released as H+ atoms)

Question 5

Ionic equation of neutralisation

Answer 5

H+ (aq) + OH- (aq) —> H2O (l)

Question 6

acid + alkali ->

Answer 6

salt + water

Question 7

An alkali is a base that

Answer 7

Dissolves in water releasing hydroxide ions

Question 8

Metal oxides, metal hydroxides, metal carbonates and ammonia are all classified as […]

Answer 8

Bases

Question 9

What other product do carbonates react with an acid to form

Answer 9

Carbon dioxide

Question 10

Dissociation in sulfuric acid example

Answer 10

H2SO4 = a strong acid, but this is true only for one of the two H atoms.
-> When sulfuric acid is mixed with water each H2SO4 molecule dissociates, releasing just one of its two hydrogen atoms as an H+ ion:

H2SO4 (aq) -> H+ (aq) + HSO4- (aq)

The resulting HSO4- (aq) ions then only partially dissociate:

HSO4- (aq) <-> H+ (aq) + SO42- (aq)

Question 11

Techniques when making a standard solution

Answer 11

• viewing the meniscus and graduation line at eye level
• traces of the solution rinsed into the flask with distilled water
• invert the volumetric flask to mix the solution thoroughly

Question 12

10cm^3 Pipette uncertainty

Answer 12

+- 0.04cm^3

Question 13

25cm pipette uncertainty

Answer 13

+- 0.06cm^3

Question 14

50cm^3 uncertainty

Answer 14

+- 0.10 cm^3

Question 15

n =

Answer 15

c x v