Topic 12: Acid-base Equilibria 1️⃣

No description yet. This curated deck is ready for daily study.

Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Define a bronsted lowry acid

Back (Answer)

Proton donor

Front (Question)

Define a bronsted lowry base

Back (Answer)

Proton acceptor

Front (Question)

Define a bronsted lowry conjugate acid

Back (Answer)

Species formed when a base accepts a proton

Front (Question)

Define a bronsted lowry conjugate base

Back (Answer)

The species formed when a proton is removed from a base

Front (Question)

Define strong acids

Back (Answer)

An acid that almost completely dissociates into ions when in aqueous solution

Front (Question)

Define a weak acid

Back (Answer)

An acid that only partially dissociates when in aqueous solution

Front (Question)

Give the equation to calculate pH

Back (Answer)

pH = -log[H+]

Front (Question)

Give the equation to calculate conc of H+ ions using pH

Back (Answer)

[H+] = 10^-pH

Front (Question)

Give the equation to calculate the [H+] in weak acids

Back (Answer)

[H+] [A-] Ka = ————- [HA]

#10

Front (Question)

Give the equation to calculate pKa

Back (Answer)

pKa = -logKa

#11

Front (Question)

How do you calculate Ka from pKa

Back (Answer)

Ka = 10^-pKa

#12

Front (Question)

What does a low pKa value indicate

Back (Answer)

Strong acid

#13

Front (Question)

What is the effect of diluting strong acids

Back (Answer)

If you dilute a strong acid 10 times its pH will increase by one unit Diluting it 100 times would therefore increase the pH by two units

#14

Front (Question)

How do weak acids behave upon dilution

Back (Answer)

Weak acids are not fully dissociated in solution so diluting them causes the equilibrium to shift to oppose the change. This means a 10 times dilution of a weak acid would increase the pH by less than one unit

#15

Front (Question)

What is the equilibrium constant for Kw

Back (Answer)

Kw = [H+][OH-]

#16

Front (Question)

How does temp affect the value of Kw

Back (Answer)

The forward reaction in the equilibrium of water is endothermic and is therefore favoured when the temp of water is increased. As a result as temp increases, more H+ ions are produced making water more acidic

#17

Front (Question)

Give the equation for pKw

Back (Answer)

pKw = -log Kw

#18

Front (Question)

Give the equation for Kw from pKw

Back (Answer)

Kw = 10^-pKw

#19

Front (Question)

What is the equivalence point

Back (Answer)

When the acid and base have reacted together in the same proportions as dictated by the stoichiometric equation

#20

Front (Question)

What does the end point refer to

Back (Answer)

When the colour of the indicator just changes colour

#21

Front (Question)

What does the pH at the equivalence point depend on ?

Back (Answer)

The combination of acid and base used Eg strong acid strong base, weak acid strong base etc.

#22

Front (Question)

Describe the pH titration curve for a strong acid strong base titration

Back (Answer)

• starts at approx pH 14 finishes at approx pH 0.5 (uses full scale) • pH only falls by a very small amount until large steep section quite near the equivalence point

#23

Front (Question)

What is plotted on the x and y axis of a pH titration curve ?

Back (Answer)

x axis = volume of acid added y axis = pH

#24

Front (Question)

Describe the pH titration curve for a weak acid strong base titration

Back (Answer)

• starts at approx pH 14 finishes at approx pH 3 (uses 3/4 of scale) • curve like that of strong acid strong base pH titration up to equivalence point • past the equivalence point the mixture acts as a buffer resisting any fluctuations in pH upon further addition of acid