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02 005 08 030 0001 0024 00 0025 0025 010 ph

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Unformatted text preview: q) 4 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 Buffer Solutions Could a strong acid and its salt be used in a strong its 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 lowers pH raises 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 weak 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 weak acid 2− 2− HC O3 / CO3 buffer solution Buffer Solution 1L water 1L Buffer Buffer Capacity Buffer Buffer capacity: the amount of acid or base neutralized by amount or the buffer before there...
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