Homework 04. Acids, Bases, and Salts

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1 HW04 - Acids, Bses, nd Slts! This is preview of the published version of the quiz Strted: Feb 21 t 8:59m Quiz Instruc!ons Homework 04 Acids, Bses, nd Slts Question 1 In the reversible rection HCN + H O CN + H O, 2 the two Bronsted-Lowry cids re HCN nd CN - H O nd CN 2 - H O nd H O 2 + There is only one Bronsted-Lowry cid shown: H O. + HCN nd H O + Question 2 A wter solution of sodium cette is bsic becuse... sodium cette is only wekly ionized. the conjugte bse of the cette ion is strong bse. the cette ion cts s Bronsted-Lowry bse in rection with wter. Pge 1 of 12

2 The sttement is flse. A wter solution of sodium cette is cidic. Question According to the Bronsted-Lowry concept of cids nd bses, which of the following sttements bout bse is NOT true? A bse will shre one of its electron pirs to bind H. + A bse rects with n cid to form slt. A bse must contin hydroxide group. If bse is strong, then its conjugte cid will be reltively weker. Question 4 Which of the following is true in pure wter t ny temperture? ph = 7.0 [H O ] = [OH ] + - K decreses with incresing temperture. w [H O ][OH ] = 1.0 x Question 5 Wht is [H O + ] when [OH - ] =. x 10-9 M? -9. x 10 M -6.0 x 10 M Pge 2 of 12

3 x 10 M -5. x 10 M Question 6 A strong cid (or bse) is one which... should only be used when wering goggles nd gloves. dissocites completely in queous solution. rects with slt to form wter. dissolves metls. Question 7 Which of the following substnces is strong cid? H SO 2 4 H CO 2 H PO 4 HF HSO Question 8 HCN is clssified s wek cid in wter. This mens tht it produces... Pge of 12

4 reltively lrge frction of the mximum number of possible hydronium ions. reltively smll frction of the mximum number of possible hydronium ions. no hydronium ions. 100% of the mximum number of possible hydronium ions. Question 9 Which of the following substnces is wek cid? HI HNO H CO 2 HClO 4 HClO H SO 2 4 HBr HCl Question 10 Which is NOT conjugte cid-bse pir, respectively? H O : OH 2 - H O : H O + 2 SO : HSO Pge 4 of 12

5 HCN : CN - Question 11 The conjugte bse of H SO is: 2 4 HSO 4 HSO 4 - SO 4 2- H SO 4 + Question 12 Wht is the conjugte cid of NO -? HNO NO 2 - NO 2- NH Question 1 Assume tht five wek cids, identified only by numbers (1, 2,, 4, nd 5) hve the following ioniztion constnts: x x x Pge 5 of 12

6 4-4.0 x x The nion of which cid is the strongest bse? Question 14 The term "K for the mmonium ion" describes the equilibrium constnt for which of the following rections? NH Cl(solid) + H O NH + Cl NH + H O NH + OH NH + H O NH + H O NH + OH NH + H O Question 15 If the vlue of K for pyridine (C H N) is 1.8 x 10, clculte the equilibrium constnt for the following rection: C H NH (q) + H O(l) b 5 5 C H N(q) + H O (q) x x x Pge 6 of 12

7 -1.8 x 10-9 Question 16 Wht is [OH-] in M HCl solution? 6.6 x x 10 M 1.0 M x 10 M Question 17 Which ph represents solution with 1000 times higher [OH-] thn solution with ph of 5? ph = 8 ph = 4 ph = 6 ph = 7 Question 18 Wht is the ph of 0.1 M B(OH) queous solution? Pge 7 of 12

8 Question 19 Hydroxylmine is wek moleculr bse with K = 6.6 x 10-9 b. Wht is the ph of M solution of hydroxylmine? Question 20 Wht is the ph of 0.2 M solution of potssium generte (KR-COO)? K for the generic cid R-COOH is 2.7 x Question 21 Which solution hs the highest ph? 0.1 M of KCl, K for HCl is VERY LARGE!! Pge 8 of 12

9 0.1 M of KNO, K for HNO is 4.5 x M KCH COO, K for CH COOH is 1.8 x M KClO, K for HClO is.5 x 10-8 Question 22 Wht is the ph of solution tht contins 11.7g of NCl for every 200 ml of solution? 1.0 x Question 2 Wht is the ph of solution mde by mixing mol of NCN with enough wter to mke liter of solution? K for -10 HCN is 4.9 x Question 24 Identify the list in which ll slts produce bsic queous solution. Pge 9 of 12

10 AgNO, NCHO, CrI 2 KCH COO, NCN, KF NH Cl, C H NH NO, FeI AlCl, Zn(NO ), KClO 2 4 Question 25 Wht is the ph in solution mde by dissolving moles of sodium cette (NCH COO) in enough wter to mke one liter of solution? K for CH COOH is 1.80 x Question 26 A M solution of wek monoprotic cid HA is found to hve ph of.00 t room temperture. Wht is the ioniztion constnt of this cid? 1.0 x x x 10-6 Question 27 Pge 10 of 12

11 Wht is the percent ioniztion for wek cid HX tht is 0.40 M? K = 4.0 x % % 0.20% 0.10% Question 28 A 0.28 M solution of wek cid is.5% ionized. Wht is the ph of the solution? Question 29 2 pts The ph of M queous niline is 8.2. Wht is the percentge protonted? 2.1% 0.021% % It is impossible to tell without knowing the K or the K for niline. b Pge 11 of 12

12 Quiz sved t 8:59m Submit Quiz Pge 12 of 12

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