CHEM 251 1st Edition Lecture 20 Outline of Last Lecture I. Clicker QuestionII. Solvent and Acids in WaterIII. Bronsted Acid/BaseOutline of Current Lecture IV. Clicker QuestionsV. Metal Cations in WaterVI. OxyanionsCurrent LectureVII. Clicker Questionsa. When LiCl, KCl, or AlCl3 are dissolved in water, the pH drops. Place the three species in order of increasing acidity.b. KCl < LiCl < AlCl3VIII. Metal Cations in Watera. Octahedral bonding to sodium cationb. “dative” bond: directional bondingc. complex between metal ion and organic small moleculed. any species that binds to metal = ligande.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.f. O atom donates lone pair to M+, making O gain a partial positive charge (unfavorable)i. O pulls electron density from O-H bond, making H atoms electropositiveii. Protons are more acidicg. Secondary Coordination Spherei.ii. arises from same sorts of hydrogen-bonding interactions observed in bulkwater or in stabilizing an acidh. when water bound protons become more acidic they deprotonatei. Acidity trendsi.ii. as charge density increases, aquo ligands become more acidiciii. smaller cations more acidiciv. highly charged cations more acidicv. more electronegative, more acidicj. Basicity Trendsi. Inverted from acidityii.IX. Oxyanionsa. Number of oxygensi. added O helps stabilize anionic charge so more O atoms gives very stable ions (non-basic)b. charge of oxyanionsi. more negative charge increases affinity for positively charged
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