1. What characterizes a strong acid or base? (1 point)
polar covalent bonding
complete ionization in water
presence of a hydroxide or hydrogen ion
- What is another name for the acid dissociation constant? (1 point)
- Acetic acid ionizes in water as follows:
CH3COOH + H2O CH3COO– + H3O+
Fewer than 1% of ethanoic acid molecules are ionized at any instant. The acetate ion (CH3COO– ) is therefore ____. (1 point)
a poor hydrogen-ion acceptor
a good hydrogen-ion acceptor
a poor hydrogen-ion donor
a good hydrogen-ion donor
- A substance of Ka of 1 x 10–5 would be classified as a ____. (1 point)
- A base has a Kb of 2.5 x 10–11. Which of the following statements is true? (1 point)
This is a concentrated base.
This base ionizes slightly in aqueous solution.
This is a strong base.
An aqueous solution of this base would be acidic.
1. A strong or weak base will easily separate into its ions when added to water, Therefore it will be highly soluble.
"complete ionization in water"
See above. " Ionization constant"
Look at the reaction. The CH3COOH lost a hydrogen, and the H2) gained a hydrogen to form the hydronium ion (H3O+).
Therefore, "a good hydrogen-ion donor"
- Take the negative log of that number....=5
The pH is 5. If a pH of 7 is neutral, and less than 7 is acidic, greater than 7 is basic .... Is 5 closer to 1 or 7? Is it more acidic or closer to neutral?
- Same as above. Take then negative log of Kb.....= 10.6
So is it closer to 7 (neutral) or closer to 14 (highly basic)?
1. Complete ionization in water.
A good hydrogen-ion acceptor.
5. This base ionizes slightly in aqueous.Source(s): I took the quiz.
This base ionizes slightly in aqueous solution