topic 12
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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what strength are organic acids
organic acids- weak
what is a bronsted-lowry acid
proton donor acid donates protons to bases
what is a bronsted-lowry base
Bronsted- Lowry base- proton acceptor bases accept protons from acid
what does acid base equilibria involve
involves transfer of protons between substances
what is the equation for acid-base equilibria
what is a conjugate acid
used to be a base but accepted protons to become an acid
what is a conjugate base
used to be an acid but donated protons to become a base
what is a strong acid
completely dissociates in aqueous solutions
what is the equation for the disocciation of an acid
HA ⇌ H+ + A-
what is a weak acid
partially dissociates in aqueous solutions
what is pH
potential hydrogen, measures concentration of H+ ions
how do you work out pH when given the conc. of H+ ions
pH= -log[H+]
how do you work out the conc. of H+ ions when given pH
what is the Ka expression
how do you calculate the Ka of a weak acid given the pH and molarity of the solution
1) write the ionic equation for the dissociation of the acid 2) write the equilibrium expression 3) determine the conc. of H+, HA, A- 4) calculate Ka by putting the numbers into the equilibrium expression
what does it mean when the Ka value is smaller
weaker acid
what does it mean if the KA value is larger
stronger acid as the conc. of H+ ions is larger
how to calculate molarity (HA) when given Ka and pH of a solution
HA= [H+] squared/ Ka
how do you calculate the pH of a weak acid given the molarity and Ka solution
[H+] = square root Ka x molarity then do -log[H+] to find pH
how to calculate Ka from mass and pH
1) find moles of acid using mass and mr 2) find conc of acid using moles and vol 3) 10 to the power of -pH to find [H+] 4) plug values into Ka expression
what is pKa
pKa is the negative base 10 logarithm of the acid dissociation constant (Ka)
how do you find pKa when given Ka
-log(Ka)
how to find Ka when given pKa
10 to the power of -pKa
how to calculate pH when given the molarity and pKa of the solution
1) find Ka by doing 10 to the power of -pKa 2) then do square root of Ka x molarity to find conc. of H+ ions 3) then do -log[H+]