Problem 22
What is the color of methyl red indicator in a solution of \(\mathrm{pH} 5 ?\)
Problem 24
What is the color of bromthymol blue indicator in a solution of \(\mathrm{pH} 7 ?\)
Problem 26
What is the color of phenolphthalein indicator in deionized water?
Problem 27
If the titration of a 10.0 -mL sample of sulfuric acid requires \(28.15 \mathrm{~mL}\) of \(0.100 \mathrm{M}\) sodium hydroxide, what is the molarity of the acid? $$ \mathrm{H}_{2} \mathrm{SO}_{4}(a q)+2 \mathrm{NaOH}(a q) \longrightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l) $$
Problem 28
If the titration of a \(25.0-\mathrm{mL}\) sample of acetic acid requires \(34.45 \mathrm{~mL}\) of \(0.100 \mathrm{M}\) calcium hydroxide, what is the molarity of the acid? \(2 \mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}(a q)+\mathrm{Ca}(\mathrm{OH})_{2}(a q) \longrightarrow\) $$ \mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l) $$
Problem 29
If \(34.45 \mathrm{~mL}\) of \(0.210 \mathrm{M} \mathrm{NaOH}\) neutralizes \(50.0 \mathrm{~mL}\) of phosphoric acid, what is the molarity of the acid? $$ \mathrm{H}_{3} \mathrm{PO}_{4}(a q)+3 \mathrm{NaOH}(a q) \longrightarrow \mathrm{Na}_{3} \mathrm{PO}_{4}(a q)+3 \mathrm{H}_{2} \mathrm{O}(l) $$
Problem 30
If \(29.50 \mathrm{~mL}\) of \(0.175 \mathrm{M}\) nitric acid neutralizes \(50.0 \mathrm{~mL}\) of ammonium hydroxide, what is the molarity of the base? $$ \mathrm{HNO}_{3}(a q)+\mathrm{NH}_{4} \mathrm{OH}(a q) \longrightarrow \mathrm{NH}_{4} \mathrm{NO}_{3}(a q)+\mathrm{H}_{2} \mathrm{O}(l) $$
Problem 31
How many milliliters of \(0.100 \mathrm{M}\) potassium hydroxide are required to completely neutralize \(10.0 \mathrm{~mL}\) of \(0.165 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{3} ?\) $$ \mathrm{H}_{2} \mathrm{SO}_{3}(a q)+2 \mathrm{KOH}(a q) \longrightarrow \mathrm{K}_{2} \mathrm{SO}_{3}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l) $$
Problem 32
How many milliliters of \(0.100 \mathrm{M}\) barium hydroxide are required to completely neutralize \(10.0 \mathrm{~mL}\) of \(0.225 \mathrm{M} \mathrm{HNO}_{2} ?\) $$ 2 \mathrm{HNO}_{2}(a q)+\mathrm{Ba}(\mathrm{OH})_{2}(a q) \longrightarrow \mathrm{Ba}\left(\mathrm{NO}_{2}\right)_{2}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l) $$
Problem 33
Given the molarity and density for each of the following acidic solutions, calculate the mass/mass percent concentration: (a) \(6.00 \mathrm{MHCl}(d=1.10 \mathrm{~g} / \mathrm{mL})\) (b) \(1.00 \mathrm{M} \mathrm{HC}_{2} \mathrm{H}_{3} \mathrm{O}_{2}(d=1.01 \mathrm{~g} / \mathrm{mL})\) (c) \(0.500 \mathrm{M} \mathrm{HNO}_{3}(d=1.01 \mathrm{~g} / \mathrm{mL})\) (d) \(3.00 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}(d=1.18 \mathrm{~g} / \mathrm{mL})\)
