91Ó°ÊÓ

(a) Calculate the \(\mathrm{pH}\) of \(0.55 \mathrm{MHCN}\), if \(K_{\mathrm{a}}=6.2 \times 10^{-10}\) (b) Calculate the \(\mathrm{pOH}\) of \(0.044 \mathrm{M} \mathrm{HIO}_{3},\) if \(\bar{K}_{\mathrm{a}}=0.16\).

Acetylsalicylic acid (aspirin), \(\mathrm{HC}_{9} \mathrm{H}_{7} \mathrm{O}_{4}\), is the most widely used pain reliever and fever reducer. Find the \(\mathrm{pH}\) of \(0.018 \mathrm{M}\) aqueous aspirin at body temperature \(\left(K_{\mathrm{a}}\right.\) at \(\left.37^{\circ} \mathrm{C}=3.6 \times 10^{-4}\right)\)

Across a period, how does the electronegativity of a nonmetal affect the acidity of its binary hydride?

A strong acid has a weak bond to its acidic proton, whereas a weak acid has a strong bond to its acidic proton. Explain.

Perchloric acid, \(\mathrm{HClO}_{4},\) is the strongest of the halogen oxoacids, and hypoiodous acid, \(\mathrm{HIO}\), is the weakest. What two factors govern this difference in acid strength?

Choose the stronger acid in each of the following pairs: (a) \(\mathrm{H}_{2} \mathrm{SeO}_{3}\) or \(\mathrm{H}_{2} \mathrm{SeO}_{4}\) (b) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) or \(\mathrm{H}_{3} \mathrm{~A} \mathrm{sO}_{4}\) (c) \(\mathrm{H}_{2} \mathrm{~S}\) or \(\mathrm{H}_{2} \mathrm{Te}\)

Choose the weaker acid in each of the following pairs: (a) HBr or \(\mathrm{H}_{2} \mathrm{Se}\) (b) \(\mathrm{HClO}_{4}\) or \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{H}_{2} \mathrm{SO}_{3}\) or \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

Choose the stronger acid in each of the following pairs: (a) \(\mathrm{H}_{2} \mathrm{Se}\) or \(\mathrm{H}_{3} \mathrm{As}\) (b) \(\mathrm{B}(\mathrm{OH})_{3}\) or \(\mathrm{Al}(\mathrm{OH})_{3}\) (c) \(\mathrm{HBrO}_{2}\) or HBrO

Choose the weaker acid in each of the following pairs: (a) HI or HBr (b) \(\mathrm{H}_{3} \mathrm{~A}_{5} \mathrm{O}_{4}\) or \(\mathrm{H}_{2} \mathrm{SeO}_{4}\) (c) \(\mathrm{HNO}_{3}\) or \(\mathrm{HNO}_{2}\)

What is the key structural feature of all Bronsted-Lowry bases? How does this feature function in an acid-base reaction?