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United States (325,163)
Chemistry (249)
CHEM 111 (69)
Lecture

Concentration, molarity, molar solutions, chemical equations, balancing equations, using equations

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Department
Chemistry
Course
CHEM 111
Professor
Dana Johnson
Semester
Fall

Description
8 November Announcements No class on Friday 11-19 The Friday after Exam 4 Mid-check grades now posted Check RamCT “C” cutoff is 70% Concentration Amount of solute in a given volume of solution Intensive property – independent of volume and amount Molarity (M) One expression of concentration M = moles of solute / liters of solution 5M solution of NaOH → 5 moles of NaOH per 1 liter of solution 2.5 moles of NaOH per 0.5 L of solution Clicker question How many grams of Na PO 3re 4here in 7.5 x 10 mL of a 0.60 M solution of Na PO ?3 4 A. 0.45 g B. 204 g C. 74 g D. 7.4 g mL→g 750 mL x 1 L / 1000 mL x 0.6 mol / 1 L x 16394 g / 1 mol 74 g Molar solutions Correct volume essential Not the case with all types of concentration Dissolving the solute may change the volume Exact volume not received till after dissolving Chemical equations Statement that expresses the amount and identities of substance involved in a chemical change “Reactants react to produce products” Reactants → Products Mass is conserved → total mass of reactants MUST equal total mass of the products Must be balanced Equations cont’d Chemical equations use formulae that cannot change Formulae show specific ratios of atoms Only coefficients can be changed to balance the equation Balancing equ
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