91Ó°ÊÓ

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.

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?

Tooth enamel is composed of a mineral known as hydroxyapatite, which has the formula \(\mathrm{Ca}_{5}\left(\mathrm{PO}_{4}\right)_{3}(\mathrm{OH}) .\) Explain why tooth enamel can be eroded by acidic substances released by bacteria growing in the mouth.

What are the equilibrium concentrations of \(\mathrm{Cu}^{+}\) and \(\mathrm{Cl}^{-}\) in a saturated solution of copper(I) chloride at \(25^{\circ} \mathrm{C} ?\)

In which of the following solutions will \(\mathrm{CaF}_{2}\) be most soluble? (a) \(0.010 M \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} ;\) (b) \(0.01 M \mathrm{NaF}\) (c) \(0.001 M\) NaF; (d) \(0.10 M \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\)

The average concentration of sulfate in surface seawater is about \(0.028 M .\) The average concentration of \(\mathrm{Sr}^{2+}\) is \(9 \times 10^{-5} M .\) Is the concentration of strontium in the sea significantly controlled by the insolubility of its sulfate salt?

Will calcium fluoride precipitate when \(125 \mathrm{mL}\) of \(0.375 M\) \(\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}\) is added to \(245 \mathrm{mL}\) of \(0.255 M \mathrm{NaF}\) at \(25^{\circ} \mathrm{C} ?\)

A solution is \(0.010 M\) in both \(\mathrm{Br}^{-}\) and \(\mathrm{SO}_{4}^{2-} .\) A \(0.250 M\) solution of lead(II) nitrate is slowly added to it using a burette. a. Which anion will precipitate first? b. What is the concentration of the first anion when the second one starts to precipitate at \(25^{\circ} \mathrm{C} ?\)

When silver oxide dissolves in water, the following reaction occurs: $$ \mathrm{Ag}_{2} \mathrm{O}(s)+\mathrm{H}_{2} \mathrm{O}(\ell) \rightarrow 2 \mathrm{Ag}^{+}(a q)+2 \mathrm{OH}^{-}(a q) $$ If a saturated aqueous solution of silver oxide is \(1.6 \times 10^{-4} M\) in hydroxide ion, what is the \(K_{\mathrm{sp}}\) of silver oxide?