# Equilibria Involving Ions

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1. What is the Bronsted-lowry definition of an acid?
An acid is a proton donor
2. What is the Bronsted-lowry definition of an alkali?
An alkali is a proton acceptor
3. For every acid there is a conjugate base, formed by the ____ of a proton?
loss
4. For every alkali there is a conjugate acid, formed by the ____ of a proton?
gain
5. What equation can the ionisation of water be represented by?
H2O(l) + H2O(l) ↔ H3O+(aq) + OH-(aq)
6. Is water amphoteric?
Yes, it can act as an acid or a base
7. The dissociation constant for the ionisation of water is known as the ionic product and is represented by...?
• Kw = [H3O+][OH-]
• Or more simply Kw = [H+][OH-]
8. What does the value of the ionic product vary with?
Temperature
9. At 25˚C what is the value of Kw?
Approximately 1 x 10-14 mol l-1
10. What equation is used to calculate the pH of a solution?
pH = -log[H+]
11. What does this equation represent?
HA(aq) + H2O(l) ↔ H3O+(aq) + A-(aq)
The dissociation in aqeous solution of an acid of general formula HA
12. How is the acid dissociation constant of acid HA given by?
Ka = [H3O+][A-] / [HA]
13. What is the conjugate base of an acid of general formula HA?
A-
14. The dissociation constant of an acid can be represented by pKa where..?
pKa = -log Ka
15. How is the relationship of the pH of a weak acid to its dissociation constant represented?
• pH = 0.5pKa - 0.5logc
• (c = concentration)
16. What does this equation represent?
B(aq) + H2O(l) ↔ BH+(aq) + OH-(aq)
The dissociation in aqueous solution of a base of general formula B
17. What is the conjugate acid of a base of general formula B?
BH+
18. How can the dissociation of the conjugate acid of the base be represented as?
BH-(aq) + H2O(l) ↔ B(aq) + H3O-(aq)
19. How is the dissociation constant of the conjugate acide represented?
Ka = [B][H3O-] / [BH+]
 Author: Anonymous ID: 192267 Card Set: Equilibria Involving Ions Updated: 2013-01-11 18:17:15 Tags: Chemistry Folders: Description: Advanced Higher Chemistry - Unit Two - Equilibria involving ions Show Answers: