5a.Lec07E4W10

# 5a.Lec07E4W10 - E4 Acids Bases and Salts Part 1 Structure...

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1 E4 Acids, Bases, and Salts Session one of two session lab Complete Parts 1 and 2 in lab (after E3 discussion) Start or complete Part 3 as time allows Part 1. Structure and Acid-Base Properties Information Information Acids and Bases usually contain O, H, and some other element (X). Teams will be provided with compounds labeled with the formula X c O a H b (X= some element; a, b, & c = some number ) Part 1 Data Analysis The number of oxygen atoms? The number of hydrogen atoms? The position of element X in the Periodic Table? The electronegativity of element X? Are the pH and acid-base properties of X c O a H b compounds dependent on: E4 Acids, Bases, and Salts Background information pH Example: pH 7 = - log [ 1 x 10 -7 ] [H 3 O + ] = mole/liter units pH values are unitless pH = - log [H 3 O + ] pH and [H 3 O + ] DIGIT/S LEFT of the pH decimal point J = POWER of TEN by which the hydronium concentration value is multiplied. If pH = 3 .27 [H 3 O + ] = [ ? ] x 10 -3

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2 [H 3 O + ] pH 14 10 -14 ↓↑ ↓↑ 10 10 -10 9 10 -9 8 10 -8 7 10 -7 6 10 -6 5 10 -5 4 10 -4 3 10 -3 2 10 -2 1 10 -1 pH [H 3 O + ] As [H 3 O + ] increases, pH decreases: pH = 1 reflects a ten fold change in [H 3 O + ]; pH = 2 reflects a hundred fold change in [H 3 O + ], etc . pH measurement pH indicator pH paper pH meter (e.g., bromothymol blue) Acid or Base? ID of acid (HCl) versus base (NH 4 OH) with indicators, pH paper, and pH meter. 14 ↓↑ 10 9 8 7 6 5 4 3 2 1 pH ACID = pH < 7 BASE = pH > 7 Universal indicator Acid or base? 2.0 NO 3 H 5.6 BO 3 H 3 11.5 LiOH Acid/base pH 0.01 M acid acid base Based on the pH, indicate if each compound is an acid or base.
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5a.Lec07E4W10 - E4 Acids Bases and Salts Part 1 Structure...

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