Version 001 HW6 Acids, Bases and Salts vandenbout (51540)
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1 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) 1 This print-out should have 45 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Msci points Assume that five weak acids, identified only by numbers (1, 2, 3, 4, and 5), have the following ionization constants. Ionization Acid Constant K a value The anion of which acid is the strongest base? Msci points The term K a for the ammonium ion describes the equilibrium constant for which of the following reactions? 1. NH 3 + H 2 O NH OH 2. NH 4 Cl(solid) + H 2 O NH Cl 3. NH H 2O NH 3 + H 3 O + 4. NH OH NH 3 + H 2 O 5. NH 3 + H 3 O + NH H 2O 6. The term is misleading, because the ammonium ion is not an acid. ChemPrin3e T points If the value of K b for pyridine is , calculate the equilibrium constant for C 5 H 5 NH + (aq)+h 2 O(l) C 5 H 5 N(aq)+H 3 O + (aq) Msci points Which of the following is true in pure water at any temperature? 1. [H 3 O + ] = [OH ] 2. ph = [H 3 O + ][OH ] = ph = 7.0 or greater than K w decreases with increasing temperature. Msci points Which is NOT a conjugate acid-base pair? 1. H 2 : H 2. H 2 O : OH 3. HCl : Cl 4. H 2 SO 4 : SO 2 4
2 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) 2 5. H 3 SO + 4 : H 2SO 4 Brodbelt points What is the conjugate acid of NO 3? 1. OH 2. H + 3. HNO 3 4. NH 3 5. NO NO 2 Msci points What is[h 3 O + ]when [OH ]= M? M M M M M Msci points What is [OH ] in a M HCl solution? M M M M M Mlib points Which ph represents a solution with 1000 times higher [OH ] than a solution with ph of 5? 1. ph = 6 2. ph = 7 3. ph = 4 4. ph = 1 5. ph = 8 6. ph = ph = ph = 3 9. ph = 2 Brodbelt points What is the ph of a 0.12 M Ba(OH) 2 aqueous solution? Msci points Hydroxylamine is a weak molecular base with K b = What is the ph of a M solution of hydroxylamine? 1. ph = ph = ph = ph = 10.37
3 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) 3 5. ph = ph = ph = 4.74 Salt of HA ph points What is the ph of a 0.29 M solution of potassium generate (KR-COO)? K a for the generic acid (R-COOH) is Mlib points At 25 C, the ph of a water solution of a salt of a WEAK acid and a STRONG base is 1. equal to the hydrogen ion concentration. 2. less than greater than about 7. Ch18 num90c points What is the ph of a 0.14 M solution of anilinium nitrate (C 6 H 5 NH 3 NO 3 )? K b for aniline is Your answer must be within ± 0.4% CIC T points The ph of lemon juice is approximately 2.4. At this ph, the hydronium ion concentration is closest to which value? M M M M Msci points Which solution has the highest ph? M of KNO 2, K a HNO2 = M of KHCOO, K a HCOOH = M of KCH 3 COO, K a HC2H 3O 2 = M of KCl, K a HCl = very large M of KClO, K a HClO = Mlib points What is the ph of a solution that contains 11.7 g of NaCl for every 200 ml of solution? Msci points
4 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) 4 A M solution of a weak acid HA has a ph of What is the poh of the solution? 1. None of these Mlib points A solution has a ph of Find the poh None of these Holt da 16 5 practice (part 1 of 2) 10.0 points The ph of an aqueous solutionis measured as Calculate the [H 3 O + ]. Answer in units of M 021 (part 2 of 2) 10.0 points Calculate the [OH ]. Answer in units of M Nsci points What is the ph of a solution made by mixing 0.05mol ofnacnwithenough water to make a liter of solution? K a for HCN is and K w = Msci points Identify the list in which all salts produce a basic aqueous solution. 1. AgNO 3, NaCHO 2, CrI 3 2. CH 3 NH 3 Cl, KNO 3, NaBz (sodium benzoate) 3. NH 4 Cl, C 6 H 4 NH 3 NO 3, FeI 3 4. KCH 3 COO, NaCN, KF 5. AlCl 3, Zn(NO 3 ) 2, KClO 4 Msci A points What is the ph in a solution made by dissolving mole of sodium acetate (NaCH 3 COO) in enough water to make one liter of solution? K a for CH 3 COOH is Msci a points A0.200Msolutionofaweak monoproticacid HA is found to have a ph of 3.00 at room temperature. What is the ionization constant of this acid?
5 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) Msci points Whatisthepercent ionizationforaweakacid HX that is 0.40 M? K a = % % % % % Mlib points A 0.28 M solution of a weak acid is 3.5% ionized. What is the ph of the solution? ChemPrin3e T points The ph of M aniline(aq) is What is the percentage aniline protonated? % % % % % Msci points A 20 ml sample of 0.20Mnitricacid solution is required to neutralize 40 ml of barium hydroxide solution. What is the molarity of the barium hydroxide solution? M M M M M Solutions points When an acid and base neutralize each other, the products are generally water 1. an ion. 2. a salt. 3. a gel. 4. a colloid. Brodbelt points How many moles of Ca(OH) 2 are needed to neutralize three moles of HCl? one 3. three
6 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) eight 6. six 7. four 8. two Holt da 16 6 sample points A 28.2 ml sample of a solution of RbOH is neutralizedby 20.73mL ofa2.792msolution of HBr. What is the molarity of the RbOH solution? Answer in units of M Brodbelt points For the neutralization reaction involving HNO 3 and LiOH, how much of 2.10 M HNO 3 is needed to neutralize 22.2 L of a 4.66 M LiOH solution? The molar mass of LiOH is 23.95g/mol. ThemolarmassofHNO 3 is63.1 g/mol. The density of the HNO 3 solution is 1.06 g/ml. The density of the LiOH solution is 1.15 g/ml. 1. 1,620,000 g g g g 5. 56,600 g g g 8. 52,200 g Brodbelt points An aqueous solution is prepared with 2 moles of HCl and 1 mole of Ca(OH) 2. The resulting solution contains mainly of 1. water and Cl, H +, and Ca 2+ ions. 2. water and Cl, H +, OH, and Ca 2+ ions. 3. water and Cl and Ca 2+ ions. 4. water and Cl, OH, and Ca 2+ ions. Brodbelt points Assume you have a 0.4 M solution of acetic acid that is 1.3 percent ionized or dissociated. What is the ph? Msci points Determine the total ionic equation for the reaction between HBr(aq) and Ba(OH) 2 (aq). 1. 2HBr+Ba(OH) 2 BaBr 2 +2H 2 O 2. 2H + +2Br +Ba 2+ +2OH Ba 2+ +2Br +2H 2 O 3. 2Br +Ba 2+ BaBr H + +2OH 2H 2 O Lyon e4 22a points If aqueous acetic acid is reacted with sodium hydroxide, which of the following substances are in the net ionic equation? 1. acetate ion, hydroxide ion, hydronium ion, and water
7 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) 7 2. acetic acid, sodium ion, hydroxide ion, and acetate ion 3. acetate ion, hydronium ion, and water 4. acetic acid, hydroxide ion, hydronium ion, acetate ion, and water 5. acetic acid, hydroxide ion, acetate ion, and water CIC T points Identify the products of the chemical equation 3LiOH+H 3 PO 4 1. Li 3 P+2H 2 O+H 3 O H+3O 2 +H 3 Li 3 3. Li 3 PO 4 +3H 2 O 4. 3LiH+(OH) 3 PO 4 CIC T points What are the products of the following reaction? 1. SrNO 3 +H 2 O 2. SrH 2 +HNO 5 Sr(OH) 2 +2HNO 3 3. Sr(NO 2 ) 2 +2H 2 O 2 4. Sr(NO 3 ) 2 +2H 2 O Mlib points Aqueous ammonia can be used to neutralize sulfuric acid (H 2 SO 4 ) and nitric acid (HNO 3 ) to produce two salts extensively used as fertilizers. They are 1. NH 4 SO 3 and NH 4 OH, respectively. 2. (NH 4 ) 2 SO 4 and NH 4 NO 3, respectively. 3. cyanamide and cellulose nitrate, respectively. 4. NH 4 SO 4 and NH 4 NO 3, respectively. ChemPrin3e J points Identify the salt that is produced from the acid-base neutralization reaction between ammonia and hydroiodic acid. 1. ammonium iodide 2. ammoniun chloride 3. ammonium iodate 4. ammonium bromide Brodbelt points What volume of M Ca(OH) 2 would be needed to neutralize 15.8 L of 1.51 M HCl? L L L L L Mlib points It was found that 25 ml of M HCl neutralized 40 ml of NaOH solution. What was the molarity of the base solution? M M
8 Version 001 HW6 Acids, Bases and Salts vandenbout (51540) M M Nsci points The ph of a solution of hydrochloric acid is What is the molarity of the acid? Answer in units of mol/l Murray E points How many moles of NaOH are needed to neutralize three moles of HCl? 1. four two 4. three 5. six 6. eight one
mccord (pmccord) HW6 Acids, Bases and Salts mccord (51520)
mccord (pmccord) HW6 Acids, Bases and Salts mccord (51520) 1 This print-out should have 45 questions. Multiple-choice questions may continue on the next column or page find all choices before answering.
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