6) A 0.1803 g sample containing only Pb,0 and inert matter gives 0.23788 of Pbso.. Calculate the percent of Pb in the sample? A) 9.0 % B) 90.1% C) 18.0% D) 22.5% 7) The precipitation titration is more successful: A) As the solubility product is greater ionic Product B) As the solubility product equals the pH of the solution C) As the solubility product is smaller Tonic Adult D) As the solubility product equals the pk of the reaction 8) For a buffer solution made by midng equal volumes of weak acid and its salt of the same concentration A) pH is less than pk. B) pH.pk, = 0 C) pH is greater than pk, D) PHpk, = 0 9) of the pH range of an acid-base indicator is between 2.3 and 4.3 then the K. of this indicator is ..... A) 4.3 B) 5.0 x 10 C) 1.3 x 10 D) 3.3 10) EDTA complexes with metals are very stable because..... A) EDTA is a hexadentate agent B) EDTA is a hexadentate chelating ligand C) EDTA is freely soluble in water D) EDTA is an octadentate chelating ligand PH-Pha.log 3214+109 Pk 109 -Top =1-197 Answer the following questions: 1) What is the pH of a buffer solution that is 0.34 M hydrofluoric acid (HF) and 0.75 M sodium fluoride (NaF? The X, for hydrofluoric acid Is 7.2 x 10 A) 4.38 (ka B) 328 C) 8.43 OSIS -10372x104 D) 3.14 2) Use Debye-Huckel equation to determine activity coefficient of Ai" at p=0.08, Ionic size = 0.9 nm A) 0.08 B) 1.97 0-5 C) 0.197 D) 0.971 1133 x -0.7655 3) What is the ionic strength of a solution that is 0.OSM in KNO, and 0.1 M in Na so,? M. cize A) 0.50 B) 0.05 (0.05 ' C10.57 D) 0:35 - 10-11x1-28 4) What is the molarity of colons in aqueous solution that contain 40 ppm of Al,CO,.? (M.Wt. 86.99 g/mol) A) 0.0014 M B) 1.400 M C) 4.100 M D) 0.235 M 5) Calculate the pH of a solution made by mixing 500 ml of 0.500 M HCOONa with 1.5L of 0.08 M HCOOH solutions. (K. of HCOOH = 1.77 x 10") +60-05)x(11 + 10.05.16 1 + (oderni