NCEA Level 3 Chemistry - Aqueous Systems
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15 Terms
Ka Meaning
Ka represents the acid dissociation constant. It's a numerical value that indicates the strength of an acid in a solution. The higher the Ka the stronger the acid.
pKa Meaning
pKa is a numerical value that indicates the acidity of a molecule, specifically how readily it donates protons. The lower the pKa, the stronger the acid.
Weak Acid formula
Weak base formula
Buffer 1 formula
Buffer 2 Formula
Dilution Formula
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.
Buffer effectiveness if pH>pKa
more effective against strong acid
Buffer effectiveness if pH<pKa
more effective against strong base
Buffer effectiveness if pH=pKa
the buffer is equally effective
I.P
the actual product of the concentrations of ions in solubility equilibria
Meaning if I.P>Ks
ppt occurs
Meaning if I.P=Ks
saturated solution
Meaning if I.P<Ks
no ppt
Note 
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