Problem 116
Are both acid concentration and acid strength important in determining the concentration of \(\mathrm{H}_{3} \mathrm{O}^{+}\)in an acid solution? Explain.
Problem 117
Describe what happens when \(\mathrm{NaF}\) dissolves in water. Describe the acid or base properties of this solution.
Problem 118
Write an equation that shows what happens when \(\mathrm{Ba}(\mathrm{OH})_{2}\) dissolves in water. What is the \(\mathrm{pH}\) of \(0.01 M\) \(\mathrm{Ba}(\mathrm{OH})_{2}\) ?
Problem 119
Can the pH of a solution of \(\mathrm{NaOH}\) ever be less than 7 at \(25^{\circ} \mathrm{C}\) ? Explain.
Problem 120
Can the pH of a solution of \(\mathrm{HCl}\) ever be greater than 7 at \(25^{\circ} \mathrm{C}\) ? Explain.
Problem 121
Which should have the lower pH, a \(0.10 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}\) solution or a \(0.10 \mathrm{M} \mathrm{HNO}_{3}\) solution? Explain.
Problem 122
Consider the reaction classifications we studied in Chapter 5. For each reaction type given, write a chemical reaction in which \(\mathrm{HCl}\) is a reactant. (a) neutralization (double-displacement) (b) single-displacement
Problem 123
Water in a properly maintained swimming pool with a \(\mathrm{pH}\) of \(7.5\) has approximately equal concentrations of \(\mathrm{HOCl}(a q)\) and \(\mathrm{OCl}^{-}(a q)\). (a) Write a balanced equation showing the acid and conjugate base in equilibrium. (b) Describe what happens to this equilibrium when an acid, such as \(\mathrm{HCl}\), is added? What happens to the relative concentrations of \(\mathrm{HOCl}\) and \(\mathrm{OCl}^{-}\)? What happens to the \(\mathrm{pH}\) of the pool water?
Problem 124
Explain why ions such as \(\mathrm{Cl}^{-}, \mathrm{NO}_{3}^{-}\), and \(\mathrm{I}^{-}\)do not act as bases in water.
Problem 126
Formic acid, \(\mathrm{HCO}_{2} \mathrm{H}\), is the substance present in fire ants that causes a sting when they bite you. What is the conjugate base of formic acid?
