III Titration Ch 19 Acids Bases C Johannesson

III. Titration Ch. 19 - Acids & Bases C. Johannesson

A. Neutralization • Chemical reaction between an acid and a base. • Products are a salt (ionic compound) and water. C. Johannesson

A. Neutralization ACID + BASE SALT + WATER HCl + Na. OH Na. Cl + H 2 O strong neutral HC 2 H 3 O 2 + Na. OH Na. C 2 H 3 O 2 + H 2 O weak strong basic • Salts can be neutral, acidic, or basic. • Neutralization does not mean p. H = 7. C. Johannesson

B. Titration • Analytical method in which a standard solution is used to determine the concentration of an unknown solution. C. Johannesson standard solution unknown solution

B. Titration • Equivalence point (endpoint) • Point at which equal amounts of H 3 O+ and OH- have been added. • Determined by… • indicator color change • dramatic change in p. H • NOTE: end point and eq. pt are not the same! • End point depends on the indicator used C. Johannesson

B. Titration + O moles H 3 = moles M V n = M V n M: Molarity V: volume n: # of H+ ions in the acid or OH- ions in the base C. Johannesson OH

B. Titration C. Johannesson

B. Titration C. Johannesson

B. Titration • 42. 5 m. L of 1. 3 M KOH are required to neutralize 50. 0 m. L of H 2 SO 4. Find the molarity of H 2 SO 4. H 3 O + M=? V = 50. 0 m. L n=2 OHM = 1. 3 M V = 42. 5 m. L n=1 C. Johannesson MA V A n A = M B V B n B M(50. 0 m. L)(2) =(1. 3 M)(42. 5 m. L)(1) M = 0. 55 M H 2 SO 4