Chapter 13: Problem 73
Codeine (Cod), a powerful and addictive painkiller, is a weak base. (a) Write a reaction to show its basic nature in water. Represent the codeine molecule as Cod.
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Consider an acid HY \((\mathrm{MM}=100 \mathrm{~g} / \mathrm{mol}[3\) significant figures]). What is the pH of a \(33.0 \%\) by mass solution of HY \((d=1.10 \mathrm{~g} / \mathrm{mL}) ?\) The \(K_{\mathrm{a}}\) of HY is \(2.0 \times 10^{-8} .\)
Consider an aqueous solution of a weak base, NaB \((\mathrm{MM}=233 \mathrm{~g} / \mathrm{mol})\). It has a pH of 10.54 . The freezing point of the solution is \(-0.89^{\circ} \mathrm{C}\) and its density is \(1.00 \mathrm{~g} / \mathrm{mol}\). Find \(K_{\mathrm{b}}\) for the weak base \(\mathrm{B}^{-}\).
Calculate \(\mathrm{H}^{+}\) and \(\mathrm{OH}^{-}\) in solutions with the following \(\mathrm{pH}\). (a) 9.0 (b) 3.20 (c) -1.05 (d) 7.46
Give the formula for the conjugate base of (a) \(\mathrm{H}_{2} \mathrm{AsO}_{4}^{-}\) (b) \(\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}(\mathrm{OH})^{+}\) (c) \(\mathrm{HClO}_{3}\) (d) \(\mathrm{NH}_{4}^{+}\) (e) \(\mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\)
Arrange the following aqueous \(0.1 \mathrm{M}\) solutions in order of decreasing \(\mathrm{pH}\) (highest to lowest). \(\begin{array}{lllll}\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} & \mathrm{HCl} & \mathrm{H}_{2} \mathrm{SO}_{4} & \mathrm{NaClO} & \mathrm{KOH}\end{array}\)
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