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
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 10 + - -14 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
-7 1.0 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
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 4 2-4 - Pge 4 of 12
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: 1-1.0 x 10 2 -.0 x 10-2.6 x 10 - -5-7 Pge 5 of 12
4-4.0 x 10 5-7. x 10-9 -11 The nion of which cid is the strongest bse? 1 2 4 5 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 4 2 4 + - NH + H O NH + OH 2 4 + - NH + H O NH + H O 4 + 2 + NH + OH NH + H O 4 + - 2 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) 5 5 + b 5 5 C H N(q) + H O (q) 2 5 5 + -9 5.6 x 10-6 5.6 x 10 8 1.8 x 10-16 Pge 6 of 12
-1.8 x 10-9 Question 16 Wht is [OH-] in 0.0050 M HCl solution? 6.6 x 10-5 -7 1.0 x 10 M 1.0 M -12 2.0 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? 2 1. 1. Pge 7 of 12
8.7 9.98 Question 19 Hydroxylmine is wek moleculr bse with K = 6.6 x 10-9 b. Wht is the ph of 0.0500 M solution of hydroxylmine? 10.4 9.26 9.48 8.9 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 10-8. 10.60 10.47 10.8 10.2 Question 21 Which solution hs the highest ph? 0.1 M of KCl, K for HCl is VERY LARGE!! Pge 8 of 12
0.1 M of KNO, K for HNO is 4.5 x 10 2 2-4 0.1 M KCH COO, K for CH COOH is 1.8 x 10-5 0.1 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 10-7 9.0 10-1 7.0 Question 2 Wht is the ph of solution mde by mixing 0.050 mol of NCN with enough wter to mke liter of solution? K for -10 HCN is 4.9 x 10. 10-12 11 Question 24 Identify the list in which ll slts produce bsic queous solution. Pge 9 of 12
AgNO, NCHO, CrI 2 KCH COO, NCN, KF NH Cl, C H NH NO, FeI 4 6 4 AlCl, Zn(NO ), KClO 2 4 Question 25 Wht is the ph in solution mde by dissolving 0.100 moles of sodium cette (NCH COO) in enough wter to mke one liter of solution? K for CH COOH is 1.80 x 10. -5 5.74 10.25 8.87 9.25 Question 26 A 0.200 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 10-5. 2.0 x 10-9 5.0 x 10-6 Question 27 Pge 10 of 12
Wht is the percent ioniztion for wek cid HX tht is 0.40 M? K = 4.0 x 10-7. 0.0010% 0.0020% 0.20% 0.10% Question 28 A 0.28 M solution of wek cid is.5% ionized. Wht is the ph of the solution? 1.46.17 2.01 0.55 Question 29 2 pts The ph of 0.010 M queous niline is 8.2. Wht is the percentge protonted? 2.1% 0.021% 0.0021% It is impossible to tell without knowing the K or the K for niline. b Pge 11 of 12
Quiz sved t 8:59m Submit Quiz Pge 12 of 12