CHEM 1211 Lecture 11 Outline of Last Lecture I Stoichiometry II Clicker Questions III Concept Building IV Aqueous Reactions A Molarity Outline of Current Lecture I Problem One II Problem Two III Dilution of Solution A Problem One IV Chemical Thermodynamics A Heat Transfer 1 Through a Liquid Current Lecture I Problem One 27 0mL of a solution that is 0 100M in nickel II nitrate reacts with 14 0mL of a solution that is 0 0800M in sodium phosphate What mass of nickel phosphate is produced 3 Ni NO3 2 aq 2Na3PO4 aq 6NaNO3 aq Ni3 PO4 2 s 0 0270L 0 100 mole Ni NO3 2 1 mole Ni PO4 2 366 02g Ni PO4 2 0 329g L 3 mole Ni NO3 2 1 mole Ni PO4 2 0 0140L 0 0800 mole Na3PO4 1 mol Ni3 PO4 2 366 02g Ni3PO4 0 205g L 2 mol NiNa3PO4 1 mole Ni3PO4 II Problem Two 20 00mL of H2SO3 solution is diluted to total volume of 50 00mL The Final solution titrated with 16 78mL of NaOH What is the molarity of the original H2SO3 solution 1100M NaOH H2SO3 aq 2NaOH NaSO3 aq 2H2O l 0 01678L 0 1100mol NaOH 1 mole H2SO3 1 1 845 x 10 2M L 2 mol NaOH 0 05000L III IV Dilution of Solution To dilute a solution add solvent to a concentrated solution i e Making tea or soda The number of moles of solute in the two solutions remain constant M1V1 M2V2 Used for dilutions not chem Rxns or titrants A Problem One 20 00mL of H2SO3 solution is diluted to total volume of 50 00mL The Final solution titrated with 16 78mL of NaOH M1 1 845 x 10 2M 50 00mL 4 613 x 10 2M V1 20 00mL M2 1 845 x 10 2M 20 00mL V2 50 00mL Chemical Thermodynamics A Heat Transfer 1 How do we know that heat is transferred through a liquid Hot metal Tmetal Twater Heat q Hot Cold until equilibrium qAu qH2O O
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