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Midterm

Material from Midterm 2 2011.doc

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Department
Chemistry
Course
CHM1311
Professor
A L L
Semester
Spring

Description
11A 285 g sample of a base symbolized by B with a molar mass of4509 gmol was dissolved in water to produce 1000 ml of solution with a pH1153Write the equation for the reaction of B in water and calculate the ionization constant Kb for this base What is the equilibrium constant for the following reactionBH HOBHO23AnswerBH2OBH OH2285g4509gmol6321 x 10 0632M3 pH1153 pOH141153log OH247 OH3388 x 10BH2O BH OHI 0632 3 3 3 C 3388 x 103388 x 103388 x 10 3 E 06286 3388 x 103388 x 10325 3388 x 1006286Kb1826 x 10The reaction corresponds to Ka of the conjugate acid of base B Calculated from the relationship KwKa x Kb for a conjugate pair14510 Thus Ka101826 x 10547 x 10
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