16. The pH of a weak monoprotic acid (HA) is 3.75. If the ionization constant for this acid is 8.9 x 10-6, what is the concentration of the weak acid? (a) 0.890 M (d) 0.00355 M (b) 5.05 M (e) 0.00712 M (c) 0.0500 M
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- 2. Which of the following solutions has a pH = 15? (A) A solution cannot have a pH = 15. (B) 1.0 x 10-15 M NaOH (C) 10.0 M NaOH (D) 15 M NaOH (E) 1.0 M NaOHDetermine the pH of each of the following solutions. (a) 0.826 M hydrocyanic acid (HCN) (weak acid with K₂ = 4.9e-10). 5.81 (b) 0.656 M hypobromous acid (weak acid with K₂ = 2.5e-09). (c) 0.673 M pyridine (weak base with Kb = 1.7e-09).The pH scale for acidity is defined by pH – log10 H*| where |H*| is the concentration of hydrogen ions measured in moles per liter (M). (A) The pH of Drano is 13.3. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M (B) The pH of rain water is 5.5. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M
- (a) A 50.0 mL solution is prepared to be 1.29 M acetylsalicylic acid. In the first step, 8.55 mL of NaOH is titrated into the solution until the pH is exactly 5.0. What is the concentration of the titrant (NaOH)? (b) In the second step, enough 5.85 M nitric acid is added to the solution after the titration in part (a) is complete until the pH is one unit lower than the pKa of acetylsalicylic acid. What volume (mL) of nitric acid was added?A citrus tree can't get the nutrients it needs from the soil if its pH is above 6.5. (a) The hydrogen ion concentration of a soil sample is [H+] = 1.58 × 10−7 M. What is the pH of the soil? (Round your answer to one decimal place.)Is this soil suitable for citrus trees? Yes No (b) After the soil is amended, the pH is 5.6. Is the amended soil more acidic or less acidic than the original soil? more acidic less acidicDetermine the pH of each of the following solutions.(a) 0.246 M hydrocyanic acid (HCN) (weak acid with Ka = 4.9e-10).(b) 0.228 M propionic acid (weak acid with Ka = 1.3e-05).(c) 0.850 M pyridine (weak base with Kb = 1.7e-09).
- Which of the following is a strong acid in aqueous solution? (a) Mg(OH)2 (b) NH3 (c) H2SO4 (d) CH3COOH (e) AgClCalculate the pH of a solution that has a hydrogen concentration of 2.5 x 10-4 mol/L. (2A)What is the molar hydronium ion concentration in solutions with each of the following pH values? (a) 1.0 [H3O+] = M (b) 5.0 [H3O+] = M (c) 9.0 [H3O+] = M (d) 12.0 [H3O+] = M
- Determine the pH of each of the following solutions.(a) 0.684 M hypochlorous acid (weak acid with Ka = 3e-08).(b) 0.399 M hydrogen peroxide (weak acid with Ka = 2.4e-12).(c) 0.751 M pyridine (weak base with Kb = 1.7e-09).Determine the pH of each of the following solutions.(a) 0.762 M hypobromous acid (weak acid with Ka = 2.5e-09).(b) 0.558 M hydrosulfuric acid (weak acid with Ka = 9.5e-08).(c) 0.543 M pyridine (weak base with Kb = 1.7e-09).Determine the pH of each of the following solutions. (a) 0.549 M hydrogen peroxide (weak acid with Ка 3 2.4e-12). (b) 0.615 M acetic acid (weak acid with Ka 1.8e-05). (c) 0.866 M pyridine (weak base with Kp = 1.7e- 09).