11863095
Beschreibung
Mindmap von Opris Irina, aktualisiert more than 1 year ago
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Erstellt von Opris Irina
vor fast 7 Jahre
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ka and pka
- kc = [Products]/[Reactants]
- kc[H2O) = ka
- Acid dissociation constant
- Acid dissociation constant
- ka = [H+][A-]/[HA]
- As ka increases, strength increases
- As pka decreases, strength increases
- HCl - monobasic acid
- H2SO4 - dibasic
- H3PO4 - tribasic
- pH = -log10[H+]
- kw = [OH-][H+]
- [H+] = sqrt kw
- [H+] = sqrt kw
- ka = [H+][A-]/[HA]
- H+ = sqtr ka[HA]
- H+ = sqtr ka[HA]
- A buffer is a solution that maintains an
almost constant pH when small amounts
of acid or base are added to it
- Buffer consists of a roughly
50:50 mix of a weak acid and
one of its salts
- Making a buffer
- Take a known amount of acid and a known
amount of salt and mix them together
- Take a known amount of a
weak acid and "half neutralise"
it with a strong base
- Take a known amount of acid and a known
amount of salt and mix them together
- In a buffer [HA] and [A-] concentrations are high
- Adding a base
- [HA] decreases
- [A-] increases
- [HA] decreases
- Adding an acid
- [HA] increases
- [A-] decreases
- [HA] increases
- Buffer consists of a roughly
50:50 mix of a weak acid and
one of its salts
- Buffers: pka + log10[A-]/[HA] = pH
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