cgier 35

Question 1

all living things are – depending heavily on – equilibrium especially —-

Answer 1

• water based
• aqoues
• acid base equilibria
  ( proteins , dna , blood , acid and base groups which are found in macromolecules ( proteins ) and smaller molecules)

Question 2

in arhenous definition acid and bases are :
acids are —
bases are —-

Answer 2

• gives h+ ions
• oh- ions

Question 3

in browsed Lowry acid and bases are:
acids :
bases :

Answer 3

• h+ donors
  -+h accepotors

Question 4

blood plasma ph is —-

Answer 4

7.35 - 7.45

Question 5

— are systems of chemical equilibria that can resist serious changes in the PH upon the addition of acids and bases

Answer 5

buffer

Question 6

– is an example of amphoteric which means it acts as an acid if – in found and acts as base if —

Answer 6

• h20
• presence of base
• presence of acid

Question 7

— completely dissociate in water and is 100% ionisation in aqoues solution
examples:

Answer 7

strong acids
- HCL04 > HI > HBR > HCL > H2SO4 > HNO3

Question 8

hcl is a — and once it dissociates we’ll get the following products :

Answer 8

• strong acids
• HCl –> h30- + cl-

Question 9

strong bases will — in water and are 100% ionised in aqueous solution such as:

Answer 9

• dissociate completely
• NaOH , KOH , Ba(OH) , LiOH
  such as: NaOH –> Na+ OH-
  ( weak acids include : nh3 , ch3nh2)

Question 10

stronger the acid — the conjugate base
stronger the base — the conjugate acid
in these situations of strong acids and bases we use – arrows

Answer 10

weaker, weaker , single headed arrows

Question 11

the Ka and Kb express the relative concentration of —- species at equilibrium and their typical values are —

Answer 11

ionised ( charged ) and unionised
so :
ionised ( charged aka products) / unionised ( reactants )
values are less than 1 ( 10-3 to 10-10 )

Question 12

-by using the Ka and Kb we predict the — of the weak acids and weak bases
- the weak acids and bases ionises — and we use – arrow

Answer 12

-strength
- partially
- equilibrium

Question 13

1-what is Kw —
2-the pure water can slightly conduct — due to —-
3- the kw value is:
4- the kw is constant with – and increases with —
5- Kw is = to —- for a —

Answer 13

• the ion product of water by which we will have 2 water moliocules to produce :
  h20 + h20 –> h3o+ + oh-
• slightly conduct electricity bc of autodissosiation
• 1 x 10-14 at 25 c
• constant w/ given temp and increases with tempreture
• Ka x Kb for a conjugate acid-base pair

Question 14

Ka x Kb will give
to find Ka:
to find kb :

Answer 14

Kw bc Ka x Kb = (h3O+) (OH-)
ka = kw / kb
kb= kw/ka

Question 15

ph+ pOH =

Answer 15

14

Question 16

we measure the ph by –
the formula for the ph scale is
the formula for the POH scale is

Answer 16

ph metre , -log10( H+) , -log10 (OH-)