Following up on the Acid Base Lab Properties

Following up on the Acid -Base Lab

Properties of Acids � Sour to taste � Turn litmus red � Phenolphthalein stays colorless � Electrolytes (conduct) � React with some metals to form H 2 gas � How do we recognize an acid from its formula? � What are the p. H values for acids?

Properties of Bases � Bitter to taste � Slippery to touch � Turn litmus blue � Phenolphthalein turns MAGENTA!!!!! � Electrolytes � How do we recognize a base from its formula? � What are the p. H values for bases?

What is p. H? � Pouvoir hydrogene: “hydrogen power” � p. H=measure of [H 3 O+] (Acidity) � [H 3 O+] expressed in powers of 10 ex: 10 -14 to 10 -1 **Formula for calculation: -log [H 3 O+] = p. H

Calculations for p. H � if [H 3 O+] is: a. 1. 00 x 10 -3 M b. 1. 00 x 10 -6 M c. 1. 00 x 10 -7 M

Here’s some more… � p. OH = -log [OH-] � [OH-] x [H 3 O+] = 1 x 10 -14 � p. H + p. OH = 14 � So…. . � If If p. H is 2, then p. OH is 12 [OH-] is: a. 1. 0 x 10 -5 b. 1. 0 x 10 -12

Reactions of Acids and Bases � What is the p. H of HCl solution? � What is the p. H of Na. OH solution? � What should the final p. H of the solution be? � Write the equation for the reaction. � Acids and bases neutralize one another. �Acid + base salt + water �Salt is made of cation from base and anion of acid

Acid-Base Titration � Analytical method in which a standard (known concentration) solution is used to determine concentration of another Complete the virtual titration lab for homework This is the same reaction you did yesterday in lab!