Chemistry – Mar 31, 2017 Get out Limiting Reactant Worksheet for HMK check Do Now – Smores Homework reward. If you have done the homework, you may make.

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Presentation transcript:

Chemistry – Mar 31, 2017 Get out Limiting Reactant Worksheet for HMK check Do Now – Smores Homework reward. If you have done the homework, you may make a smore. There is also milk. Today’s Objective – Molarity Agenda Hmk Review Molarity Solution Stoichiometry Assignment: Molarity Worksheet

Concentrations of Solutions The concentration of a solution designates the amount of solute dissolved in a volume of solvent to create a solution. The greater the amount of solute dissolved in a certain amount of solvent, the more concentrated the solution is. Qualitatively, concentration can be represented by color intensity.

Molarity By far, the most common concentration unit: Watch your units. Amount of solute must be in moles, not grams. Amount of solution must be in Liters, not mL or grams. Ex: What is the molarity of a solution of 3.25 mol of NaHCO3 dissolved in 750 mL of water? Ex: How many moles are there in 75 mL of a 3.5 M NaOH solution? Ex: What volume of a 1.50 M AlCl3 solution is needed to obtain 0.250 mol AlCl3? Ex: What is the molarity of a solution if 75.0 g of Ca(OH)2 is dissolved in 650 mL of water?

Complete Stoichiometry Grams of X Not Here!! Grams of Y Gas Volume of X Gas Volume of Y 22.4 L 22.4 L Molar mass Molar mass Molarity of X Molarity of Y Reaction Coefficients Moles of X Moles of Y X X Macroscopic scale Volume of X Volume of Y 6.022x1023 6.022x1023 Reaction Coefficients Number of X Number of Y Atomic scale

Solution Stoichiometry Practice How many grams of NaOH are needed to neutralize 20.0 mL of 0.150 M H2SO4 solution? How many liters of 0.500 M HCl(aq) are needed to react completely with 0.100 mol of Pb(NO3)2(aq), forming a precipitate of PbCl2(s)?

Solution Stoichiometry Combine MV = mol with reaction stoichiometry. Ex: Consider the reaction 2 KI (aq) + Pb(NO3)2 (aq)  PbI2 (s) + 2 KNO3 (aq) How much 0.115 M KI solution will completely react with 0.104 L of 0.225 M Pb(NO3)2 solution?

Exit Slip - Homework Exit Slip: How many moles of HCl are present in 15.3 mL of a 0.500 M solution? What’s Due? (Pending assignments to complete.) Molarity worksheet What’s Next? (How to prepare for the next day) Read p100-102, p224-232, 241 p246-247