CHEM 1011 Experiment 11: Charles’ Law: the Volume-Temperature Relationship of a Gas

Objectives • To measure the volume of a fixed quantity of air as the temperature changes at constant pressure. • To verify Charles’ Law.

Introduction • Charles’s Law states that when the pressure is held constant, the volume of a fixed mass of ideal gas is in direct proportion to the temperature in degrees Kelvin. • V = k. T or k = V/T

Introduction • For two sets of V and T: V 1/T 1 =V 2/T 2 or • V 1 T 2=V 2 T 1 or • (V 1 T 2)/(V 2 T 1)=1

Chemicals and Equipment • • Boiling stones Bunsen burner(or hot plate) 250 m. L Erlenmeyer flasks(2) 800 m. L beakers(2) Clamps Glass tubing Marking pencil

Chemicals and Equipment(cont. ) • • • One-hole rubber stopper Ring stand Ring support Rubber tubing Thermometer Wire gauze

Calculations • To determine T 1, measure the temperature of the ice bath. • To determine T 2, measure the temperature of the boiling water.

Calculations • Vw is the volume of water sucked into Flask 1. • V 2 is the volume of air at the temperature of boiling water which is determine from measuring the volume of Flask 1. • V 1 is the volume of air at the temperature of the boiling water which is calculated from V 1 = V 2 - Vw

Calculations • Charles’s Law can be determined from calculation V 2 T 1/V 1 T 2 • The percent deviation can be calculated by subtracting the number verifying Charles’s Law (8) from 1. 00, dividing by 1. 00, and multiplying by 100 % = 1. 00 -(8) x 100