Which of the following 1.0 M solutions would have the highest pH? Weak Acid Ka Weak Base Kb HCN 4.9 x 10-10 HONH, 1.1 x 10-8 HNO2 4.5 x 104 NH3 1.8 x 10-5 HIO 2.3 x 10-11 CHINH, 4.3 x 10-10 HBrO 2.5 x 10-9 H¸NNH₂ 1.3 x 10-6 CHCOOH 6.3 x 105 CH N 1.7 x 10-9 A KCN B C CH NHCI Nalo + D NH Br

The pH of a 0.10-M solution of propanoic acid, CH3CH2COOH, a weak organic acid, is measured at equilibrium and found to be 2.93 at 25 °C. Calculate the Ka of propanoic acid.

Calculate the pH and the pOH of each of the following solutions at 25 C for which the substances ionize completely: (a) 0.000259 M HClO4. (b) 0.21 M NaOH. (c) 0.000071 M Ba(OH)2. (d) 2.5 M KOH

Students are often surprised to learn that organic acids, such as acetic acid, contain OH groups. Actually, all oxyacids contain hydroxyl groups. Sulfuric acid, usually written as H2SO4, has the structural formula SO2(OH)2, where S is the central atom. Identify the acids whose structural formulas are shown below. Why do they behave as acids, while NaOH and KOH are bases? a. SO(OH)2 b. ClO2(OH) c. HPO(OH)2