Problem 81
Identify an amphiprotic substance given the following reactions:$$ \begin{aligned} \mathrm{HCl}(a q)+\mathrm{NaH}_{2} \mathrm{PO}_{4}(a q) & \longrightarrow \mathrm{H}_{3} \mathrm{PO}_{4}(a q)+\mathrm{NaCl}(a q) \\ \mathrm{NaOH}(a q)+\mathrm{NaH}_{2} \mathrm{PO}_{4}(a q) \longrightarrow & \mathrm{Na}_{2} \mathrm{HPO}_{4}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \end{aligned} $$
Problem 82
Identify an amphiprotic substance given the following reactions:$$ \begin{array}{c} \mathrm{HCl}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{H}_{3} \mathrm{O}^{+}(a q)+\mathrm{Cl}^{-}(a q) \\ \mathrm{NH}_{2}^{-}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{NH}_{3}(a q)+\mathrm{OH}^{-}(a q) \end{array} $$
Problem 83
What is the \(\mathrm{pH}\) of a \(0.50 \mathrm{M} \mathrm{HCl}\) solution?
Problem 84
What is the \(\mathrm{pH}\) of a \(0.50 \mathrm{M} \mathrm{NaOH}\) solution?
Problem 87
Write the net ionic equation for the reaction of the weak electrolytes acetic acid and ammonium hydroxide.
Problem 88
Write the net ionic equation for the reaction of the strong electrolytes nitric acid and potassium hydroxide.
Problem 89
Alanine, abbreviated HAla, is an amino acid in protein. If \(21.05 \mathrm{~mL}\) of \(0.145 \mathrm{M}\) NaOH neutralizes \(0.272 \mathrm{~g}\) HAla, what is the molar mass of the amino acid?
Problem 90
Cream of tartar, abbreviated KHTart, is used in baking. If \(42.10 \mathrm{~mL}\) of \(0.100 \mathrm{KOH}\) neutralizes \(0.791 \mathrm{~g}\) KHTart, what is the molar mass of cream of tartar?
Problem 92
Why is acid rain harmful to trees and how does it destroy forests?
