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A saturated solution of magnesium hydroxide contains undissolved solid. Which change will shift the position of the equilibrium to the right? Mg(OH)2(s) ⇌ Mg2+(aq) + 2 OH−(aq) A. Adding more solid Mg(OH)2 B. Adding dilute hydrochloric acid C.…
Magnesium hydroxide is the active ingredient of some indigestion remedies, which neutralize excess hydrochloric acid in the stomach. (i) Write an equation for the reaction of magnesium hydroxide with hydrochloric acid. (ii) Calculate the mass, in g, of…
Four reactions at 298 K have the equilibrium constants listed below. Which constant belongs to the reaction with the lowest (most negative) standard Gibbs energy change, ΔG⊖? A. 2.7 × 103 B. 3.1 × 10−4 C. 9.5 × 10−2…
A reaction has a standard Gibbs energy change, ΔG⊖, of −8.0 kJ mol−1 at 298 K. Which statement about the equilibrium constant, K, and the equilibrium mixture is correct? A. K < 1; the equilibrium mixture contains mostly…
Which products are formed when dilute hydrochloric acid reacts with solid calcium carbonate? A. Calcium chloride and water B. Calcium chloride, carbon dioxide and water C. Calcium chloride and hydrogen D. Calcium hydroxide and carbon dioxide
The table shows the acid dissociation constants of two substances. A third substance, methanol, does not ionize in water. Which sequence shows the aqueous solutions, all of equal concentration, in order of increasing electrical conductivity? A. methanol <…
Which row correctly describes a weak Brønsted–Lowry acid? A. Ionizes only partially; its conjugate base is relatively strong B. Ionizes almost completely; its conjugate base is relatively strong C. Ionizes almost completely; its conjugate base is very weak D.…
Which graph represents the pH curve for the titration of a weak acid with a strong base? A. Graph A B. Graph B C. Graph C D. Graph D
The pKa of the ammonium ion, NH4+, is 9.25 at 298 K. What is the pKb of its conjugate base, NH3, at this temperature? A. −4.75 B. 4.75 C. 9.25 D. 23.25
Which mixture forms an acidic buffer solution? A. 25 cm3 of 0.10 mol dm−3 NaOH added to 50 cm3 of 0.10 mol dm−3 ethanoic acid B. 25 cm3 of 0.10 mol dm−3 NaOH added…