Unformatted text preview: q)
ni w H 2 O (l) + NH 3 (aq) 0.02 × 0.05 0.8 × 0.30 =0.001 = 0.024 0.0 0.025
0.025 0.10 pH = 9.25 + log(0.25 0.28) = 9.20 Buffer
Could a strong acid and its salt be used in a
solution to maintain pH?
No!!! HCl + NaCl system Why?
HCl (aq) → H + (aq) + Cl - (aq) No equilibrium exists!
Extra H+ increases [H+]
Extra OH- depletes [H+] lowers
raises pH Which
Which of the following is (are) buffer systems?
(a) KF/HF, (b) KBr/HBr , (c) Na2CO3/NaHCO3 (a) HF is a weak acid and F- is its conjugate base
buffer solution HF / F − (b) HBr is a strong acid
not a buffer solution
(c) CO32- is a weak base and HCO3- is its conjugate
HC O3 / CO3
buffer solution Buffer Solution
Buffer Buffer Capacity
Buffer capacity: the amount of acid or base neutralized by
the buffer before there...
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- Fall '14
- pH, Buffer solutions, buffer solution