Problem 88
Calculate the \(\mathrm{pH}\) at \(25^{\circ} \mathrm{C}\) of a \(0.25-M\) aqueous solution of phosphoric acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right) .\left(K_{\mathrm{a}_{1}}, K_{\mathrm{a}_{2}}\right.\), and \(K_{\mathrm{a}}\), for phosphoric acidare \(7.5 \times 10^{-3}, 6.25 \times 10^{-8},\) and \(4.8 \times 10^{-13},\) respectively.)
Problem 89
Calculate the \(\mathrm{pH}\) at \(25^{\circ} \mathrm{C}\) of a \(0.25-M\) aqueous solution of oxalic acid \(\left(\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4}\right) \cdot\left(K_{\mathrm{a}_{1}}\right.\) and \(K_{\mathrm{a}_{2}}\) for oxalic acid are \(6.5 \times 10^{-2}\) and \(6.1 \times 10^{-5}\), respectively.)
Problem 92
List four factors that affect the strength of an acid.
Problem 93
How does the strength of an oxoacid depend on the electronegativity and oxidation number of the central atom?
Problem 94
Predict the relative acid strengths of the following compounds: \(\mathrm{H}_{2} \mathrm{O}, \mathrm{H}_{2} \mathrm{~S},\) and \(\mathrm{H}_{2} \mathrm{Se}\).
Problem 95
Compare the strengths of the following pairs of acids: (a) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and \(\mathrm{H}_{2} \mathrm{SeO}_{4}\) (b) \(\mathrm{H}_{3} \mathrm{PO}_{4}\) and \(\mathrm{H}_{3} \mathrm{AsO}_{4}\)
Problem 96
Which of the following is the stronger acid: \(\mathrm{CH}, \mathrm{ClCOOH}\) or \(\mathrm{CHCl}_{2} \mathrm{COOH}\) ? Explain your choice.
Problem 97
Consider the following compounds:
Problem 98
Define salt hydrolysis. Categorize salts according to how they affect the \(\mathrm{pH}\) of a solution.
Problem 99
Explain why small, highly charged metal ions are able to undergo hydrolysis.
