Acids, bases and equilibria Flashcards Preview

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Flashcards in Acids, bases and equilibria Deck (12):
1

acid def and eq?

substance that donates a proton (needs to contain proton ie H+) (NO ELECTRONS TRANSFERRED THIS AINT REDOX MAN) HA + H2O A- + H3O+

2

base def and eq?

substance that accepts a proton (needs to have lone pair) B- + H2O BH + OH-

3

what does strength of acid/base indicate?

the extent to which the substance ionises (fully, partially)

4

describe the relationship between acid strength, Ka and pKa

strong acid -> ionises fully; Ka will be large, pK will be small.

5

pH eq?

-log10[H3O+]

6

pOH eq?

-log10[OH-]

7

KW eq?

=[OH-][H3O+]=10^-14 at 25*C

8

Ka?

[a-][H3O+]/[HA] INCLUDE UNITS - M

9

Kb?

[BH][OH-]/[B-] INCLUDE UNITS - M

10

pKa?

-log10[Ka]

11

describe how a buffer soltion works

-made of weak acid and conj base. (HA, A-)
-if you add an acid it ionises forming H3O+. reacts with A- to form HA and H2O so the pH doesnt change
-add base: ionises to form OH-. reacts with HA to form H2O and A-

12

henderson hasselbach equation?

pH = pKa + log10 [A-]/[HA] (or nA-/nHA)