CHEM 1F92 Lecture Notes - Lecture 13: A Roads In Zone 3 Of The Great Britain Numbering Scheme, Titration, Electrolyte

• School: Brock University
• Department: Chemistry
• Course: CHEM 1F92
• Professor: Lydia W.L.Chen

Document Summary

A 325 ml sample of solution contains 24. 3g of cacl2. Mw cacl2 = 40. 08 + 2(35. 45) = 110. 98g/mole. 24. 3g cacl2 x ( 1 mole cacl2/ 110. 98g cacl2) x (2 mole cl- / 1 mole cacl2) x (1/325ml) Acid-base titrations: slowly add base to unknown acid until the indicator changes colour. 2naoh + h2so4 na2so4 + 2h2o (4. 50 moles h2so4 / 1l h2so4) x 25 ml h2so4 x (1l / 1000 ml) x (2 mole naoh / 1 mole. H2so4) x (1 l naoh / 1. 420 moles naoh) x (1000 ml / 1l) Redox titrations: reactant 1 of accurately known concentration, accurate volume of reactant 2 of unknown concentration, slowly add reactant 1 to reactant 2 until the mixture changes colour. Iron (ii) can be oxidized by an acidic k2cr2o7 solution according to the net ionic solution: 2- + 6 fe2+ + 14h+ 2cr3+ + 6fe3+ + 7h2o.