Which one of the following compounds would be significantly more soluble in an acidic solution than in pure water? Select one: a. Ca(CIO4)2 b. Bal2 c. AgCN d. NaNO3 e. NH4CI

5. A common buffer solution can be prepared by using ammonia and ammonium salts. The base equilibrium constant is 1.815×10-5. A student is preparing a pH buffer solution with 2.561 M NH3 solution and (NH4)2SO4 solid. Please answer the following questions. A. B. What is the best pH buffer range of the buffer solution that can be prepared by NH3 solution and (NH4)2SO4 solid? Please put down "1" if the answer is pH = 4.741 ± 1, please put down "2" if the answer is pH = 4.741 ± 10, please put down "3" if the answer is pH = 9.26 ± 1, please put down "4" if the answer is pH = 9.26 ± 10. Your answer follows. Assume that the addition of the solid will NOT change the volume, how many grams of is needed to prepare a pH = 8.66 buffer solution? The volume of the buffer solution is 250.0 mL. grams

23. A 1 L solution initially contained 0.42 M fluoride anion and 0.33 M HF (K₂ = 7.2 ×10¯4). What is the pH of the solution described if the following additions are made: a. 100 mL of 0.2 M HCl (added to original solution): b. 100 mL of 0.2 M NaOH (added to original solution): A: 3.20; 3.29

Match the solubility of the following compounds.  BaCO3 A or B NaCO3 A or B KOH A or B (NH4)2SO4 A or B A. insoluble B. soluble

Please answer both the question otherwise I'll downvote