Answered: The density of a 5.26MNaHCO 3 (84.0…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter14: Equilibria In Acid-base Solutions

Section: Chapter Questions

Problem 66QAP

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1 ) The density of a 5.26MNaHCO 3 (84.0 g/mol) is 1.19g / m * l . Its molality is 2) Calculate the pAg^ + at the equivalence point in the titration of 25.0ml of 0.0823 M Kl with 0.051M AgNO 3 . Ksp Agl=8.3*10^ -16 3) Commercial concentrated aqueous nitric acid is 70.4% HNO3(63.0 g/mol) by mass and has a density of 1.41g / m * l . The molarity of this solution is 4) Consider the titration of 25ml of 0.0823M KI with 0.051M AGNO3, Kspagi =8.3x10-16 Calculate pAg* after adding 39.0 ml I03 Ag* + 103 ====AglO3 5) Commercial concentrated aqueous nitric acid is 70.4 1\%HNO 3 (63.0 g/mol) by mass and has a density of 1.41g / m * l . The molarity of this solution is: 6) What mass in g of Na 2 CO 3 [106 g/mol] is required to prepare 250 ml of 0.3M aqueous solution in Na^ + [23.g/mol] ? 7) Calculate pAg^ + after adding 42.30ml AgNO 3 In the titration of of 0.0823M Kl with 0.051M AgNO 3 . KspAgl = 8.3 * 10 ^ - 16 8) The milliliters of concentrated HClO 4 (100.5 g/mol),6 60% by mass, density = 1.668g / m * l , required to prepare 0.750 L of 0.100M solution are 9) Which of the following salts is more soluble in water AB ksp = 1.0x ^ - 8 A 2 B Ksp=1.0*10^ -8 AB 2 Ksp=1.0*10^ -8 A 2 B 3 Ksp=1.0*10^ -8 10) What is the equilibrium constant for reaction (2), If the equilibrium constant for reaction (1) is 1.8 * 10 ^ - 5 Reaction (1);NH 3(aq) +H 2 O leftrightarrow NH 4 ^ + +OH^ - ( equilibrium cons * tan t = 1.8 * 10 ^ - 5 Reaction(2);NH 4 ^ + +OH^ - leftrightarrow NH 3(aq) +H 2 O 11) The following data are for the determination of lead in Gasoline: 5.4, 6.8, 6, 5, 6.3 and 5.9 . What is the true value at 90% confidence level. (t- table at 90% C.L = 2.132). Consider significant figures , - 12) How many grams of 0.491 wt% aqueous HF (20.0g / m * o * l) are required to provide a 40% excess to react with 25.0 ml of 0.0236 M Th^ 4+ by the reaction Th^ 4+ +4F^ - ThF 4(s) ? 13) The following data were obtained for the determination of Mg in water samples 5.5, 5.7, 5.9, 3.2 and 12.5 ppm. What is the mean at 90% CL? G90%- table = 1.67 = 14) The Ksp of A 3 B 2 =1.04*10^ -23 What is its solubility in water ? 15) The wt% and the ppm concentration of a solution made by dissolving 2.5 g salt in 250ml solution (Density of fsolution = 1.0 g/ml) are 16) The density of a substance is 2.50g / L . What is it in S.1 Units(Kg/m^ 3 ) 17) A 0.8720-g sample mixture containing NaBr r(fw = 102.90g / m * o * l) and KBr (fw=119.00 g/mol) yields upon analysis of (187.77 g/mol) . 1.505 - g Then, the mass 0/0 of KBr is?

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