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BB lecture 9-5-08 water, pH

# BB lecture 9-5-08 water, pH - Chapter 3(pp.46-56 pH...

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Unformatted text preview: Chapter 3 (pp.46-56): pH, properties of water, and concentrations of solutions Learning objectives: • Define: Acids , bases , and buffers . • Be cognizant of what the pH scale is, and its application in expressing acidity. • Explain the uniqueness of water in terms of its structure and different properties. • Distinguish the difference between heat and temperature. For Monday • Know how to calculate solution strengths by percent, molarity, & osmolarity. Terms to know include: hydrophobic, hydrophilic, cohesion, adhesion, calorie, kilocalorie (aka Calorie – w/ capital ‘C’), specific heat, heat of vaporization… What do elements with atomic numbers 3, 9, 11, and 17 have in common? a. valence b. number of energy levels c. will form the same bond type d. number of valence electrons A water molecule may dissociate into a hydronium ion and a hydroxide ion: We will use the older convention of representing dissociation into hydrogen ions and hydroxide ions. H 2 O H + + OH- Note this rx is reversible In pure water, [H + ] = 10-7 M, and [OH- ] = 10-7 M, and the product is 10-14 M The negative log 10 [H+] refers to the acidity/alkalinity of a solution… called “pH” Each pH unit represents a tenfold difference in H+ and OH- concentrations In a neutral solution (pH = 7), [H...
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BB lecture 9-5-08 water, pH - Chapter 3(pp.46-56 pH...

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