Acid-base Equilibria Flashcards Preview

Chemistry A level Edexcel > Acid-base Equilibria > Flashcards

Flashcards in Acid-base Equilibria Deck (17)
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1
Q

How do you find the pH of a strong acid?

A

pH = -log10[H+]

2
Q

How do you find the pH of a weak acid?

A

Ka = [H+] [A-] / [HA]

3
Q

Define a strong acid

A

Fully dissociates in aqueous solution

4
Q

Define a weak acid

A

Partially dissociates in aqueous solution

5
Q

What is the equation for pKa?

A

pKa = -log10 Ka

6
Q

What is the equation for pKw?

A

pKw = -log10 Kw

7
Q

Which indicator has a pH range of 5-8?

A

Litmus

8
Q

Which indicator has a pH range of 3.1 - 4.4?

A

Methyl orange

9
Q

Which indicator has a pH range of 8.3 - 10?

A

Phenolphthalein

10
Q

What is a buffer solution?

A

A solution which resists changes in pH when a small amount of an acid or an alkali are added

11
Q

How do you make an acidic buffer solution?

A

Weak acid + it’s salt. Eg. Ethanoic acid and sodium ethanoate

12
Q

How do you make an alkaline buffer solution?

A

Weak base + it’s salt. Eg. Ammonia solution and ammonium chloride

13
Q

What is the Henderson-Hasselbalch equation?

A

pH = pKa + log10 ([A-] / [HA])

14
Q

What is an amphoteric substance?

A

Substance that can behave as both an acid and a base

15
Q

What is the definition of an acid?

A

Compound which can act as a proton donor

16
Q

What is the definition of a base?

A

Compound which can act as a proton acceptor

17
Q

What is an alkali?

A

A soluble base that produces OH- ions when added to water