NCEA Level 3 Chemistry - Aqueous Systems

0.0(0)

Studied by 4 people

Call Kai

Learn

Practice Test

Spaced Repetition

Match

Flashcards

Knowt Play

Card Sorting

1/14

There's no tags or description

Looks like no tags are added yet.

Last updated 6:18 AM on 2/1/26

Name	Mastery	Learn	Test	Matching	Spaced	Call with Kai

No analytics yet

Send a link to your students to track their progress

15 Terms

New cards

K_aMeaning

Ka represents the acid dissociation constant. It's a numerical value that indicates the strength of an acid in a solution. The higher the K_a the stronger the acid.

New cards

pK_a Meaning

pKa is a numerical value that indicates the acidity of a molecule, specifically how readily it donates protons. The lower the pK_a, the stronger the acid.

New cards

Weak Acid formula

$[H_{3}O^{+}]=\sqrt{Ka\times[Acid]}$

New cards

Weak base formula

$[H_{3}O^{+}]=\sqrt{\frac{Ka(conj.acid)\times Kw}{[Base]}}$

New cards

Buffer 1 formula

$pH=pKa+log\frac{[base]}{[acid]}$

New cards

Buffer 2 Formula

$[H_{3}O^{+}]=Ka\times\frac{[acid]}{[base]}$

New cards

Dilution Formula

$[o.g]\times\frac{o.g volume}{Total volume}$

New cards

What is a buffer

a solution that resists changes in pH when small amounts of acid or base are added. Buffers are typically made up of a weak acid and its conjugate base, or a weak base and its conjugate acid.

New cards

Buffer effectiveness if pH>pKa

more effective against strong acid

New cards

Buffer effectiveness if pH<pKa

more effective against strong base

New cards

Buffer effectiveness if pH=pKa

the buffer is equally effective

New cards

I.P

the actual product of the concentrations of ions in solubility equilibria