Problem 55
\(\mathrm{K}_{\mathrm{c}}\) for \(\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}\) is 10 at \(25^{\circ} \mathrm{C}\). If a con- tainer contains \(1,2,3,4\) moles per litre of \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and D, respectively at \(25^{\circ} \mathbf{C}\) the reaction shall (1) Procecd from left to right (2) Procecd from right to left (3) Be at cquilibrium (4) Nonc
Problem 56
The pII of a solution is \(5.0 .\) To this solution sufficicnt acid is added to decrease the \(\mathrm{pH}\) to \(2.0 .\) The increase in hydrogen ion concentration is (1) 1000 times (2) \(5 / 2\) times (3) 100 times (4) 5 times
Problem 57
Which addition would not change the \(\mathrm{pH}\) of \(10 \mathrm{ml}\) of dilute hydrochloric acid? (1) \(20 \mathrm{ml}\) of the same hydrochloric acid (2) \(5 \mathrm{ml}\) of pure water (3) \(20 \mathrm{ml}\) of purc water (4) \(10 \mathrm{ml}\) of concentrated hydrochloric acid
Problem 59
The gastric juice in our stomach contains cnough hydrochloric acid to make the hydrogen ion concentration about \(0.01\) mole/litre. The pII of the gastric juice is (1) \(0.01\) (2) 1 (3) 2 (4) 14
Problem 60
\(0.2\) molar solution of formic acid is \(3.2 \%\) ionized. Its ionization constant is (1) \(9.6 \times 10^{3}\) (2) \(2.1 \times 10^{4}\) (3) \(1.25 \times 10^{6}\) (4) \(4.8 \times 10^{5}\)
Problem 60
For the reaction \(\mathrm{C}(\mathrm{s})+\mathrm{CO}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{CO}(\mathrm{g})\) the partial pressurc of \(\mathrm{CO}_{2}\) and \(\mathrm{CO}\) are 4 and 8 atm, respectively, then \(\mathrm{K}_{\mathrm{p}}\) for the reaction is (1) \(16 \mathrm{~atm}\) (2) \(2 \mathrm{~atm}\) (3) \(5 \mathrm{~atm}\) (4) \(4 \mathrm{~atm}\)
Problem 61
The \(\mathrm{pH}\) of the solution containing \(10 \mathrm{~mL}\) of \(0.1 \mathrm{~N}\) \(\mathrm{NaOH}\) and \(10 \mathrm{ml}\) of \(0.05 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}\) would be (1) zero (2) 1 (3) \(>7\) (4) 7
Problem 61
The equilibrium constant for the reaction \(2 \mathrm{X}(\mathrm{g})+\) \(\mathrm{Y}(\mathrm{g}) \rightleftharpoons 2 \mathrm{Z}(\mathrm{g})\) is \(2.25\) litre \(\mathrm{mol}^{-1} .\) What would be the concentration of \(\mathrm{Y}\) at cquilibrium with \(2.0\) moles of \(\mathrm{X}\) and \(3.0\) molcs of \(\mathrm{Z}\) in \(1-\mathrm{L}\) vessel? (1) \(1.0 \mathrm{M}\) (2) \(2.25 \mathrm{M}\) (3) \(2.0 \mathrm{M}\) (4) \(4.0 \mathrm{M}\)
Problem 62
At constant temperature in a 1-L vessel when the reaction \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})\) is at equilibrium, the \(\mathrm{SO}_{2}\) concentration is \(0.6 \mathrm{M}\), initial concentration of \(\mathrm{SO}_{3}\) is \(1 \mathrm{M}\). The equilibrium constant is (1) \(2.7\) (2) \(1.36\) (3) \(0.34\) (4) \(0.675\)
Problem 63
The \(\mathrm{pH}\) of a \(1 \times 10^{8} \mathrm{M}\) aqueous solution of \(\mathrm{HCl}\) is slightly less than 7 because(1) the ionization of \(\mathrm{HCl}\) is incomplete (2) the ionization of water is negligible (3) the ionization of water at such a low concentration of \(\mathrm{HCl}\) is significant (4) the ionization of both \(\mathrm{HCl}\) and water are negligible
