20 Flashcards Preview

A Level Chemistry > 20 > Flashcards

Flashcards in 20 Deck (13):
1

What is a Bronsted Lowry acid?

Proton donor

2

What is a Bronsted Lowry base?

Proton acceptor

3

Acid + metal →

Salt + H2

4

Mono/di/tri- basic : what does the prefix refer to?

Number of hydrogens in the acid

5

What does Ka show?

Extent of dissociation (the larger, the stronger)

6

pH (equation)

-log[H+]

7

pKa (equation)

-log(Ka)

8

Kw (equation)

[H+][OH-] = 10^-14

9

Strong acid assumptions

[HA] = [H+] (full dissociation)

10

Weak acid assumptions

[HA]eqm = [HA]start
[H+]eqm = [A-]eqm

11

Calculating the pH of weak acids/bases

Kw = [H+]^2 / [HA]

12

Calculating the pH of strong bases

14 - (-log[OH-])

13

'Stronger' weak acid limitations (WRT assumptions)

[HA]eqm = [HA]start
No longer valid when [H+] becomes significant