Unit 8 Do Not Forget
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39 Terms
What components are needed to create a buffer?
Weak acid + CB (salt) or weak base + CA (salt)
Which formula can be used to find [H+] in a buffer solution?
[H+]=MaKa/[salt]
What is the effect of adding a common ion to a weak acid?
It decreases percent ionization and moves pH closer to 7
When is the equation MaVa=MbVb strictly true?
At the equivalence point
What is the expected pH at the equivalence point for a titration of a Weak Base + Strong Acid?
Below 7
For a "weak + strong" titration, what is true at the half-equivalence point?
pH=pKa and [HA]=[A−]
How can you increase the buffer capacity of a solution?
By having more moles of weak acid and conjugate base (or weak base and conjugate acid).
What is HClO4?
Strong Acid
What is HI?
Strong Acid
What is HBr?
Strong Acid
What is HCl?
Strong Acid
What is HNO3?
Strong Acid
What is H2SO4?
Strong Acid
What is CH3COOH?
Weak Acid
What is HF?
Weak Acid
What is H2CO3?
Weak Acid
What is HCOOH?
Weak Acid
What is LiOH?
Strong Base
What is NaOH?
Strong Base
What is KOH?
Strong Base
What is RbOH?
Strong Base
What is CsOH?
Strong Base
What is Cs(OH)2?
Strong Base
What is Sr(OH)2?
Strong Base
What is Ba(OH)2?
Strong Base
What is NH3?
Weak Bases
What is CH3NH2?
Weak Base
Water auto dissociation (2H2O —> H+ + OH-) is what kind of process?
Endothermic Process
When heat is added, the exothermic process is favor making Kw
Larger
When temperature decreases, the exothermic reaction is favored making Kw
Smaller
At higher temperatures, the pH will be less than 7 because
[H+] and [OH-] increase and will be larger than 1×10^-7
At lower temperatures, the pH will be more than 7 because
[H+] and [OH-] decrease and will be smaller than 1×10^-7