Unit 8

Question 1

strong acids (examples)

Answer 1

-HCl -HClO4
-HBr -HNO3
-HI -H2SO4

Question 2

strong acids

Answer 2

-fully disassociate
- [H+]= [HA]

Question 3

weak acids

Answer 3

• do not fully disassociate
  Ka= [H+][A-]/[HA]

Question 4

strong base (examples)

Answer 4

-LiOH -CsOH
-NaOH -Ca(OH)2
-KOH - Sr(OH)2
-RbOH - Ba(OH)2

Question 5

strong base

Answer 5

-fully disassociate
-[OH]=[BOH]

Question 6

weak base

Answer 6

• does not fully disassociate
  Kb= [BH][OH]/[B]

Question 7

% ionization

Answer 7

[H]/[HA] x 100
-final over initial
- same for bases

Question 8

larger % ionization means…

Answer 8

stronger acid or base

Question 9

Neutral Salt

Answer 9

SA+SB

Question 10

Basic Salt

Answer 10

SB+WA

Question 11

Acidic Salt

Answer 11

SA+WB

Question 12

indicators

Answer 12

• pick an indicator closest to your desired pH
  often equivalence point

Question 13

What do buffers do?

Answer 13

resist change in pH

Question 14

How are buffers made?

Answer 14

WA+CB
WB+CA

Question 15

when there are more mols of a buffer…

Answer 15

the buffer capacity increases

Question 16

at half equivalence pt. pH=….

Answer 16

pH= pKa

Question 17

half equivalence point

Answer 17

-ideal buffer
-in buffer region
-half of volume added
-HA=A-
-[CA]=[CB]

Question 18

SA+SB titration
SA+WB
SB+WA

Answer 18

-pH = 7
-pH<7
-pH>7

Question 19

when having both weak acid and base you…

Answer 19

compare Ka to Kb
Larger value means more acidic or basic

Question 20

polyprotic acid

Answer 20

loses one H+ atom at a time

Question 21

when there is more oxygen to an acid…

Answer 21

the acid is stronger due to the negative ions stabilizing charges

Question 22

when is a acid stronger?

Answer 22

• down a group - weaker bond
  -across a period- more electronegative

Question 23

Kw=[OH][H]=…

Answer 23

1x10^-14

Question 24

WB graph

Answer 24

starts high due to high pH
dips fast to a pH of 7

Question 25

WA graph

Answer 25

starts low due to low pH
jumps fast to a pH of 7