E3 Acid-Base chemistry & dyspepsia 2

Question 1

What does Ka mean?

Answer 1

the acid dissociation (equilibrium) constant

Question 2

Which side does the equilibrium lie for a strong acid?

Answer 2

to the right

Question 3

Which side does the equilibrium lie for a weak acid?

Answer 3

to the left

Question 4

What does pKa stand for

Answer 4

-logKa

Question 5

Does a strong acid have a large Ka and pKa?

Answer 5

Ka-large

pKa- small

Question 6

Does a weak acid have a large Ka and pKa

Answer 6

Ka- small

pKa-large

Question 7

How can pKa values be measured?

Answer 7

measuring the pH of a solution of known acid conc

Question 8

What does Kb stand for?

Answer 8

the base dissociation (equilibrium) constant

Question 9

What does pKa define for in a base?

Answer 9

strength of base described in terms of the pKa of the conjugate acid of the base

Question 10

Does a strong base have a large Ka and pKa?

Answer 10

Ka- small

pKa- large

Question 11

Does a weak base have a large Ka and pKa

Answer 11

Ka-large

pKa- small

Question 12

What does Kw stand for?

Answer 12

ionisation constant for water Kw= [H3O+] [HO-]

Question 13

What does Kw confirm?

Answer 13

that a strong base will have a weak conjugate acid

Question 14

Complete these: Ka x Kb =

pKa + pKb =

Answer 14

1) Kw

2) pKw = 14

Question 15

Define pH

Answer 15

-log[H3O+]

Question 16

Why does pH of neutrality vary with temperature?

Answer 16

the degree of ionisation of water increases with temp, hence the pH of neutrality decreases