CHEM 1A Lecture Notes - Lecture 25: Buffer Solution, Sodium Hydroxide, Stoichiometry

• School: UCSB
• Department: Chemistry and Biochemistry
• Course: CHEM 1A
• Professor: Joseph

Document Summary

Function of a weak acid in a buffer. The function of the weak acid in a buffer is to neutralize added base. The acetate ion produced by the neutralization becomes part of the available acetate. Hc2h3o2 (aq) + oh- (aq) c2h3o2. Ch3cooh + oh- ch3coo- + h2o. Major species left in solution: oh- used up. Buffer solution: ph = 4. 75 (+ 0. 08) 40 ml di water + 2 ml 1. 0 m naoh. 40 ml buffer solution + 2 ml 1. 0 m naoh. Original buffer solution, ph add h+ or oh- two step problem modified ph. Step 1: let reaction, h+ with a- or oh- with ha, go to completion . Stoichiometry problem determine new concentrations of ha and a- Titrate a strong acid with a strong base. Strong acids or strong bases, such as h+ or oh- go to completion. Equivalence point - the point in a titration where the moles of acid = moles of base.