acids and bases

Question 1

acid definition

Answer 1

proton donor

Question 2

base defintion

Answer 2

proton acceptor

Question 3

strong acid definition

Answer 3

an acid that fully dissociates

Question 4

weak acid defintion

Answer 4

an acid that partially dissociates

Question 5

pH=

Answer 5

-log10[H+]

Question 6

[H+]=

Answer 6

10^-pH

Question 7

ionic product of water (kw)=

Answer 7

[H+][OH-]

Question 8

when calculating pH of strong acid use

Answer 8

pH=-log10[H+]

Question 9

when calcualting pH of strong base use

Answer 9

rearrange kw=[H+][OH-] to get [H+] then use pH=-log10[H+]

Question 10

when calcuating pH of a weak acid use

Answer 10

ka=[H+]^2/[HA] and rearrange to get [H+] and then use pH=

Question 11

when calcuating pH of buffer use

Answer 11

ka=[H+][A-]/[HA] and rearrange to get [H+] and then use pH=

Question 12

what does acid-base equillibria involve

Answer 12

transfer of protons

Question 13

water is

Answer 13

slighty dissociated

Question 14

what varies the value of Kw

Answer 14

temp
water dissociation equation endothermic

Question 15

pKa=

Answer 15

-log10Ka
mirrors pH scale lower the pH lower the pKa value

Question 16

in a monoprtic acid [H+] =

Answer 16

[HA]

Question 17

relationship between [HA] and [H+] in diprotic acid

Answer 17

[HA] x2 = [H+]

Question 18

in a triprotic acid [H+] =

Answer 18

[HA]/3

Question 19

what does a buffer solution do

Answer 19

maintains an approximately constant pH despite dilution or addition of small amounts of acid or base

Question 20

acidic buffer solutions contain

Answer 20

excess weak acid and the salt of that weak acid

Question 21

basuc buffer solutions contain

Answer 21

excess weak base and the salt of that weak base

Question 22

at half nuetralisation point ka=

Answer 22

[H+]

Question 23

at half netralisation piont pKa=

Answer 23

pH

Question 24

if acid is added to buffer solution

Answer 24

add to the acid

Question 25

if base is added to alkali solution

Answer 25

take from the acid