BIOL 1107 1nd Edition Lecture 6 Outline of Last Lecture I II III Amino Acids Protein Assembly Different Structures of Protein Outline of Current Lecture I Water II Adhesion Cohesion III Water as a Solvent IV pH V Acids Bases Current Lecture I Water Only element in the work to exist in all three states gas liquid and solid Your body 70 water saliva keeping joints lubricated regulating body temperature etc Why does ice float Weird phenomenon that only happens with water usually most solids sink into their liquid phases Ice is able to float on liquid water because of its crystal structure and hydrogen bonds II Adhesion Cohesion Adhesion water has ability to stick to other molecules structures through hydrogen bonding Cohesion stick to other water molecules through hydrogen bonding Example trees taking up water from the roots against gravity III Water as a Solvent Polar ex sugar glucose 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 Ionic ex salt NaCl Calculations Q You mix 50 mL of a 500 g L stock solution with 450 mL of water What is your final concentration in g L a b c d 0 55 g L 50 g L 55 5 g L Not sure A Make sure to convert all mL to L M1 500 g L V1 0 050 L M2 x V2 0 50 L add 0 050 L and 0 450 L M1 V1 M2 V2 X M2 50 0 g L Why are calculations important Minor calculation mistakes have caused fatalities in the past For example mother of four dies after blundering nurse administers TEN times drug overdose Additionally a fatal zinc overdose in a neonate confusion of micrograms vs milligrams IV pH What is pH log hydronium concentration pH scale How is pH measured pH of pure water is 7 H of pure water is 1 0 X 10 7 OH of pure water is 1 0 X 10 7 A solution with an OH of 10 4 has pH of 10 Q A solution has pH 10 If you increase the H 100 fold what will the new pH be A 8 Q A pH 7 solution has the H concentration than solution at pH 5 A 100 times less Q You have a solution with a pH of 4 If you double the H what is your new pH A pH approx 3 7 3 8 Q A solution has a H of 2 0 X 10 5 What is the approximate pH of solution A pH 4 7 4 8 V Acids Bases Acids something donates H Bases receives H donates OH Will talk more about acids bases in next lecture
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