3.1.12- Acids and Bases Flashcards
What is a brønsted Lowry acid
Proton donor
What is brønsted Lowry base
Proton acceptor
What is a brønsted Lowry reaction
Reaction involving the transfer of a proton
What is a monoprotic acid
Acid that released one H+ ion per molecule
Eg HCl,HNO3
What is a diprotic acid
Acid that release two H+ ions per molecule
Eg H2SO4
Definition of ph
PH = -log(H+)
[H+] = 10^-pH
What is Kw
Kw=[H+][OH-]
What is Kw value
1.00x10-14
Effect of temperature on Kw
As temperature increases the equilibrium moves right to oppose increase in temperature
So [H+] and [OH-] increases
Kw increases and pH decreases
How to find ph of strong bases
[H+] = Kw/ [OH-]
Find ph of mixture of strong acid and strong based
Excess H+
Mol H+ Mol OH- Xs mol H+ Xs [H+] =n/v pH= -log[H+]
Find ph of mixture of strong acid and strong based
Excess OH-
Mol H+ Mol OH- Xs mol OH- Xs [OH-] = n/v [H+] = Kw/[OH-] -log[H+]
What is a weak acid or base
Only partially dissociated
Acid dissociation constant
Ka= [H+][A-]
—————
[HA]
pKa=-logKa
Ka= 10^-pKa
What does a bigger value of Ka mean or smaller value of pKa mean
A strong acid