chem help! plz!!!!!!!!!!!?
What are the characteristics of a strong acid or base? (1 point)
- Polar covalent bonding
- Complete ionization in water
- Ionic bonding
- Presence of a hydroxide or hydrogen ion
What is another name for the acid dissociation constant? (1 point)
- Equilibrium constant
- Ionization constant
- Rate constant
- Mole fraction
Acetic acid ionizes in water as follows:
CH3COOH + H2O ⇌ CH3COO– + H3O+
Fewer than 1% of ethanoic acid molecules are ionized at any given moment. 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 with a Ka of 1 x 10–5 would be classified as a ____. (1 point)
- Strong acid
- Weak acid
- Strong base
- Weak base
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.
3 Answers
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.
Ionization constant.
-
A good hydrogen-ion acceptor.
Weak acid.
5. This base ionizes slightly in aqueous.
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