6. (10 pts) A buffer is prepared such that ICH,cOOH, ICH,0L-0.100 M. What volume

Question

6. (10 pts) A buffer is prepared such that ICH,cOOH, ICH,0L-0.100 M. What volume of 0,.125 M NaOH (aq) can that the buffer capacity is lost be added to 200.0 mL of this buffer solution before its buffering capacity is lost. Assume t when the ratio Ibasel/Macidl, is less than O.1 or greater than 10. A)113mL B) 123ml· C)131mL D)145ml, E) None of these 7. What is the pH at the half-stoichiometric point for the titration of 0.010 M morphinc a) with 0,010 M HCKag)? For morphine, Kb = 1.6 × 10-6. a) 8.20 b) 5.80 c) 10.10 d) 9.95 e) 7.00

Explanation / Answer

6. E) none of these.

7. b) 7.80 is the answer.

At the half-equivalence (stoichiometric) point, pH = pKb = -log(Kb);
pKb = -log(41.6 x 10^-6) = 5.80.

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