91Ó°ÊÓ

Chromium(III) hydroxide is amphiprotic. Write chemical equations showing how an aqueous suspension of this compound reacts to the addition of a strong acid and the addition of a strong base.

Zinc hydroxide is amphiprotic. Write chemical equations showing how an aqueous suspension of this compound reacts to the addition of a strong acid and the addition of a strong base.

To remove impurities such as calcium and magnesium carbonates and \(\mathrm{Fe}(\mathrm{III})\) oxides from aluminum ore (which is mostly \(\mathrm{Al}_{2} \mathrm{O}_{3}\) ), the ore is treated with a strongly basic solution. In this treatment, \(\mathrm{Al}^{3+}\) dissolves but the other metal ions do not. Why?

Exactly \(1.00 \mathrm{g}\) of \(\mathrm{FeCl}_{3}\) is dissolved in each of four \(0.500 \mathrm{L}\) samples: \(1 M \mathrm{HNO}_{3}, 1 \mathrm{MHNO}_{2}, 1 \mathrm{MCH}_{3} \mathrm{COOH},\) and pure water. Is the concentration of \(\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}^{3+}\) ions the same in all four solutions? Explain why or why not.

What is the pH of \(0.25 M \mathrm{Al}\left(\mathrm{NO}_{3}\right)_{3} ?\)

What is the pH of \(0.50 M \mathrm{CrCl}_{3} ?\)

What is the pH of \(0.100 M \mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3} ?\)

What is the pH of \(1.00 M \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2} ?\)

Sketch the titration curve (pH versus volume of \(0.50 M\) \(\mathrm{NaOH} \text { added })\) for a \(25 \mathrm{mL}\) sample of \(0.25 \mathrm{M} \mathrm{FeCl}_{3}\)

What is the difference between molar solubility and solubility product?