 # Chemistry Questions: Buffer

## Transcribed Text

Define: Buffer Acetic Acid/Acetate Buffer HOAc / OAC Add H+ acid H+ + = HOAc lowers added H+ Add OH base OH1 + = H2O + lowers added OH1 Complete this sentence: The pH of a buffer depends on the (choose Ka or Instagram) of the acid! a) Determine the pH of a .MM HA/A buffer Ka of HA is 1 x 106 HA(aq) = H*(aq) + A(aq) Ka = [H*][A]/[HA] 1x 10 = [H*][A]/[HA] rearranging [H*]=1x106[HA]/[A] If [HA] = [A"] = .1 H+= pH=-log[H+] pH = b) Add .01molt H+ [HA]=.1+.01= [A]=.1-.01= [H+]=1x 105[1.01)/[.09]= pH = -log [H+] = c) Add .01 mol OH [HA] = .1 - .01 = [A]] =.1+.01= pH =

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Define: Buffer, in chemistry, is a solution of weak acid and its conjugate base. Its purpose is to keep the pH almost constant when small amount of strong acid or base is added.
Acetic Acid/Acetate Buffer       HOAc / OAc-
Add H+ acid          H+    +      _OAc...
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