EXAM PRACTICE QUESTIONS Questions 1 4 are for Test 3 Questions 5 17 are for the final Chapter 18 1 Classify each of the following as a strong acid strong base weak acid weak base soluble salt or insoluble base in water A Sr OH 2 B AgF C NaClO3 D Co OH 2 E H2CO3 F HI G CH3NH2 Answer A strong base B soluble salt C soluble salt D insoluble base E weak acid F strong acid G weak base 2 Calculate the Ca2 ion concentration the OH ion concentration the pOH and the pH of a 0 15 M Ca OH 2 solution Answer Ca2 0 15 M OH 0 15 M pOH 0 52 pH 13 48 3 Calculate the pH pOH H and OH of a 0 25 M HClO4 solution Answer H 0 25 M OH 3 98 cid 117 10 14 M pOH 13 4 pH 0 60 4 Answer 1 3 cid 117 10 5 M The pH of a solution of Ba OH 2 is 9 40 What is the molarity of this solution of base 5 Calculate the ionization constant for a weak acid HA that is 1 60 ionized in 0 0950 M solution Answer 2 43 cid 117 10 5 M 6 The pH of a 0 10 M solution of a monoprotic acid is 2 85 What is the value of the ionization constant of the acid Answer 2 0 cid 117 10 5 M 7 Calculate the value of H3O in a 0 010 M HOBr solution Ka 2 5 cid 117 10 9 Answer 5 0 cid 117 10 6 M 8 What is the percent ionization of 0 20 M HNO2 Ka 4 5 cid 117 10 4 Answer 4 7 9 The OH 1 3 cid 117 10 6 M for a 0 025 M solution of a weak base Calculate the value of Kb for this weak base Answer 6 8 cid 117 10 11 10 The pH of a 0 12 M solution of a weak base is 10 30 What is the value of pKb for this weak base H2A H HA Ka1 1 0 cid 117 10 7 HA H A2 Ka2 5 0 cid 117 10 11 Answer 6 48 11 The hypothetical weak acid H2A ionizes as shown below Calculate the HA in 0 20 M H2A Answer 1 4 cid 117 10 4 12 Calculate the pH of 3 2 cid 117 10 3 M H2CO3 solution Answer 4 44 13 Which of the following is the strongest base Cl HClO2 I NO3 Answer HClO2 14 The following salts are formed as neutralization products of acid base reactions Indicate whether the salts would produce acidic basic or neutral aqueous solutions A NaCN B NH4Cl C BaBr2 D CH3 3NHBr E KF Answer A basic B acidic C neutral D acidic 15 A 0 10 M solution of which of the following salts is most basic NaF NaNO2 NaCH3COO NaOCl NaCN Answer NaCN 16 What is the pH of 0 35 M KOBr solution Ka 2 5 cid 117 10 9 Answer 11 07 17 Calculate the H3O in 0 030 M KF Answer 1 5 cid 117 10 8 M 18 Calculate the pH of 0 15 M NH4NO3 solution Answer 5 04 19 What is the pH of 0 30 M FeCl2 solution The hydrated ferrous ion is Fe OH2 6 2 For Fe OH2 6 2 Ka 3 0 cid 117 10 10 Answer 5 02