acid/base

2. 3. (a) Which combination of chemicals is best to buffer the pH at approximately 9.00? Explain your reason for your choice and the reason why you did not pick either of the other two combinations (6 MC). Without doing detailed calculations, sketch the curve for the titration of 75.0 mL sample of a 0.250 mol/L trimethylamine, CH:CH-CHAN (K47.4 x 10%) with 0.200 mol/LHC titrant. Indicate: i. the approximate pH at the beginning of the titration, ii. the pH at equivalency, Ill. the approximate pH at the equivalency point, iv. and the approximate final pH. Be sure to also indicate the volumes at which the various points occur (6 MI). (b) What ratio of the acid and conjugate base ar base conjugate acid would be required (4 MI) i. ammonia (NH) and ammonium chloride (NH) acetic acid (HCH:0) and sodium acetate (NaC,H-02)