Acids and Bases Flashcards
1
Q
Hydrochloric acid is a strong acid and ethanoic acid is a weak acid.
(a) State the meaning of the term strong acid.
A
completely dissociates/ionises (to form H+ ions)
2
Q
The pH of water at 30 °C is 6.92
Give the reason why water is neutral at this temperature.
A
[H+] = [OH–]
3
Q
Give the expression for the acid dissociation constant (Ka) for ethanoic acid (CH3COOH).
Ka
A
ka = [CH3COO-][H+]
———————-
CH3COOH
4
Q
Ethanedioate ions are poisonous because they react with iron ions in the body. Ethanedioate ions are present in foods such as broccoli and spinach.
Suggest one reason why people who eat these foods do not suffer from poisoning.
A
The ethanedioic acid is only present in small quantities/low
concentration in these foods
