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CHEM111B Practice Exam 2 1). A student prepares solvings of Ca2+, Fe2+, Fe3+, Zn2+ and Mg2+, wholly at 5.0 x 10-4 M, at a buffered pH of 8.00. From the following(a) Ksp value determine whether a precipitate willing mastermind or not? |Species |Ksp | |Ca(OH)2 |6.5 x 10-6 | |Fe(OH)2 |7.9 x 10-16 | |Fe(OH)3 |1.6 x 10-39 | |Zn(OH)2 |3.0 x 10-16 | |Mg(OH)2 |7.1 x 10-12 | a) Fe3+ and Zn2+ will precipitate b)Only Fe3+ will precipitate c)Fe3+, Zn2+, and Mg2+ will precipitate d) Fe3+, Zn2+, Mg2+ and Fe2+ will precipitate 2). matter the percent ionisation of formic acid (HCHO2) in a result that is 0.311 M in formic acid and 0.189 M in nuclear number 11 formate (NaCHO2). The Ka of formic acid is 1.8 x 10-4 a) 37.8b) 0.0952c) 11.3d) 1.06 x 10-3 3) The addit ion of solid Na2SO4 to an sedimentary resultant role in proportion with solid BaSO4 (Ksp = 1.5 x 10-9 at 25oC) will cause a) no diversity in the [Ba2+] in solution b) to a great extent BaSO4(s) to dissolve c) precipitation of even more BaSO4 d) an ontogenesis in Ksp of BaSO4 4). The pH of a 0.55 M sedimentary solution of HBrO at 25oC is 4.48. What is the Ka for HBrO?

a) 2.0 x 10-9b) 1.1 x 10-9c) 6.0 x 10-5d) 3.0 x 104 5). The acid-dissociation constants for acidulous acid (H2SO3) are Ka1 = 1.7 x 10-2 and Ka2 = 6.4 x 10-8 at 25oC. attend the pH of a 0.163 M aqueous sol ution of acidulous acid. a) 4.48b) 1.35c! ) 1.77d) 1.28 6). Calculate the pOH of a 0.0827 M aqueous sodium nitrile solution (Kb CN- = 4.9 x 10-10). a) 9.31b) 10.39c) 5.20d) 8.80 7). A 0.10 M aqueous solution of __________ will have a pH of 7.0 at 25oC? a) NaOClb) KClc) NH4Cld) KCl and NH4Cl 8). Of the following, which would be the strongest acid? a) HAtOb) HAtO4c) HAtO2d) HAtO3 9). The pKa of acetic acid is 1.7 x 10-5. The pH of a buffer prepared...If you want to get a skilful essay, set up it on our website: BestEssayCheap.com

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