ENCH 213 Lecture Notes - Titration, Sodium Carbonate, Molar Concentration

• School: Queen's University
• Department: Chemistry
• Course: ENCH 213
• Professor: Diane Beauchemin

Document Summary

Percent compositions: molarity, molality, other expressions of concentrations, how to prepare a solution, correction for thermal expansion, how to calibrate volumetric glassware. Chemical concentration: amount of analyte (solute), n = cv, n = number of moles of analyte (mol, c = concentration of analyte (mol/l or m, v = volume of the solution (l) In dilutions: n is constant, c1v1 = c2v2, 1 denotes original solution, 2 denotes diluted solution. Expressions of concentration: equilibrium molarity (m): used as moles of species litres of solution eqm molarity of hcl in 2. 0m sltn = 0m moles of solute litres of solution =mass of solute. Formal concentration (f): independent of analyte composition in solution, (fm = formula mass = molecular mass, not to be confused with molality (m): moles of species kg of solvent. Molality is independent of temperature (based on weight) Effect of temperature: water expands by 0. 02%/degree near 20 c, molarity changes by -0. 02 %/oc, concentration decreases as temperature increases.