A7 Acids, Bases + Buffers

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

Card preview (24)

Front (Question)

Define a Brønstead-Lowry acid

Back (Answer)

A species that donates a proton

Front (Question)

Define a Brønstead-Lowry base

Back (Answer)

A species that accepts a proton

Front (Question)

How to tell conjugate acid-base pairs

Back (Answer)

• Differ by only an H+ • Opposite sides of the equation

Front (Question)

What is a monobasic acid

Back (Answer)

Acid that donates one proton

Front (Question)

What is a dibasic acid

Back (Answer)

Acid that donates two protons

Front (Question)

What is a tribasic acid

Back (Answer)

Acid that donates three protons

Front (Question)

Draw a mechanism for the reaction between methanoic acid and water

Back (Answer)

Front (Question)

Equation for pH of strong acids

Back (Answer)

Front (Question)

Formula to work out pH from [H+]

Back (Answer)

#10

Front (Question)

Formula to determine [H+] from pH

Back (Answer)

#11

Front (Question)

Procedure to determine the pH of weak acids

Back (Answer)

#12

Front (Question)

What assumption is made when determining the pH of weak acids to allow [H] = [A-]

Back (Answer)

[H] = [A-], as dissociation of water is negligable

#13

Front (Question)

What is the limitation with the assumptions made when calculating the pH of weak acids

Back (Answer)

With ‘stronger’ weak acids, [HA] in equilibrium being equal to [HA] undissociated may no longer be valid

#14

Front (Question)

Formula to convert pKa to Ka

Back (Answer)

#15

Front (Question)

Formula to convert pKa to Ka

Back (Answer)

#16

Front (Question)

Steps to calculate the pH of strong bases

Back (Answer)

#17

Front (Question)

Why do acids still contain some OH-

Back (Answer)

• Water dissociates

#18

Front (Question)

Define a buffer system

Back (Answer)

A system that minimises pH changes on addition of small amounts of an acid or a base

#19

Front (Question)

Steps to calculating the pH of a buffer system of a weak acid and salt of a weak acid

Back (Answer)

• Find new concentrations of acid and salt

#20

Front (Question)

Steps to calculate the pH of a buffer solution with a weak acid and a strong alkali

Back (Answer)

• Find the moles left of acid remaining, and the moles of salt now present • Find their concentrations

#21

Front (Question)

With reference to equalibrium shifts, explain what happens to a buffer solution on addition of alkali

Back (Answer)

• Alkali reacts with HA • Equilibrium shifts RHS • Towards H+ and A-

#22

Front (Question)

With reference to equalibrium shifts, explain what happens to a buffer solution on addition of acid

Back (Answer)

• H+ reacts with A- • Equilibrium shifts towards LHS • Towards HA

#23

Front (Question)

What is the equation for the buffer system in our blood

Back (Answer)

#24

Front (Question)

What does the buffer system of our blood ensure

Back (Answer)

pH range is between 7.35 and 7.45