Exam 16: Additional Aqueous Equilibria Chemistry and the Oceans

Which of the following metal hydroxides is most likely to be more soluble in strongly basic solutions rather than weakly basic solutions?

One brand of extra-strength antacid tablets contains 750 mg of calcium carbonate (100.09 g/mol) in each tablet.Stomach acid is essentially a hydrochloric acid solution.Is so much calcium carbonate really needed to neutralize stomach acid? Calculate the volume of stomach acid with a pH of 1.00 that one of these tablets could neutralize, and compare that value with the normal volume of stomach fluid, which usually is about 100.0 mL.One tablet can neutralize _______ mL of stomach acid at a pH of 1.00.

Consider the following aqueous equilibrium for a formic acid solution, HCOOH(aq) ⇄ H⁺(aq) + HCOO^-(aq).Suppose solid sodium hydroxide is added to the solution.Which statement below regarding the resulting solution is FALSE? Ignore any volume changes.

What is true about the pK_a of the most suitable acid-base indicator for a titration of acetic acid with NaOH?

In a titration of monoprotic acids and bases, there is a large change in pH

Phenylephrine (PE; see the structure below) is a nasal decongestant and is the active ingredient in Sudafed, which contains phenylephrine hydrochloride (PEHCl).This conjugate acid of phenylephrine (PEH⁺) has a pK_a= 5.5.At a physiological pH of 7.4, what is the ratio of concentrations, [PE]/[PEH⁺]?

A phosphate buffer solution (25.00 mL sample) used for a growth medium was titrated with 0.1000 M hydrochloric acid.The components of the buffer were sodium monohydrogenphosphate and sodium dihydrogenphosphate.The first endpoint occurred at a volume of 10.32 mL, and the second occurred after an additional 18.62 mL was added, for a total volume of 28.94 mL.What was the total concentration of phosphate in any form) in the buffer?

For the reaction Fe(H₂O)₆³⁺(aq) +H₂O(l) ⇄ Fe(H₂O)₅(OH)²⁺(aq) +H₃O⁺(aq), Fe(H₂O)₆³⁺(aq) is a(n) _______ and water is a(n) _______.

Hydrated transition metal ions typically produce solutions that are

A coordinate covalent bond forms when a chemical species

K_sp for magnesium fluoride is 6.5*10^-9 at 25°C.What is the molar solubility of MgF₂ in A) pure water and B) a buffer solution with a pH =1.00?

A solution of the weak acid, HF, and a solution of the strong acid, HCl, have the same pH.Which solution will require the most sodium hydroxide, NaOH, to neutralize?

Identify the Lewis acid in the following reaction: PH₃ (aq) +H⁺(aq) $\rightarrow$ PH₄⁺ (aq)

Calculate the pH of a solution that is made by mixing 0.80 L of 0.30 M formic acid (HCOOH) and 0.90 L of 0.20 M sodium formate (NaHCOO).Assume volumes are additive.(K_a, HCOOH= 1.77 *10^-4)

Which pairs of substances below can be mixed together in water to produce a buffer solution?

What is the equilibrium concentration of Cl ^- (aq) in a solution that is initially 0.0200 M solution in CuNO₃ and 0.450 M HCl(aq)? Cu⁺(aq) + 3 Cl ^- 0(aq) fi CuCl₃^{2 -} (aq) K_f = 5.0 * 10⁵

The molar solubility (s) of lead bromide (PbBr₂) is 1.2 * 10^-2 M at 25°C. 1) Write the solubility product expression for lead bromide in terms of s. 2) Calculate a value for K_sp at 25°C.

A Lewis base is any species capable of _______ an electron pair.

The pK_a of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.40 M and its conjugate base at 0.60 M.The measured pH was 7.8.What is the pK_a of the weak acid?

A buffer solution is made by dissolving 0.230 moles of sodium hypochlorite in 1.00 L of 0.220 M hypochlorous acid.What is the pH of the solution after 0.0100 moles of sodium hydroxide is added? (The K_a of HClO is 2.9 * 10^-8.)