Chemistry level 6 - Lecture 8

Question 1

what are strong acids?

Answer 1

acids that completely dissociate into ions in solution

Question 2

what are weak acids?

Answer 2

acids that partially dissociate into ions in solution

Question 3

why does a strong acid have a lower pH than a weak acid?

Answer 3

• because strong acids completely dissociate into ions in solution
• means [H+] is higher
• higher the [H+], lower the pH

Question 4

why are strong acids better conductors of electricity than weak acids?

Answer 4

produce more ions in solution due to complete dissociation

Question 5

why do strong acids react with metals faster than weak acids?

Answer 5

more ions in solution mean they will react faster with metals and metal carbonates

Question 6

what are bases?

Answer 6

any substance which will neutralise H+ ions of an acid to produce water

Question 7

what are alkalis?

Answer 7

bases which are soluble in water producing OH- ions

Question 8

what is a strong alkali?

Answer 8

alkalis that fully dissociate into ions in aqueous solution

Question 9

what is an example of a weak alkali?

Answer 9

ammonia