A solution contains 0.414 M NH4Cl(aq). What concentration of NH3 (aq) must be added to make abuffer of pH 9.55? a. 0.207 M b. 0.826 M c. 0.124 M d. 0.559 M e. 4.82 M

Write the correct dissolving equation for Al(OH)3 (s) on scratch paper, and then answer the following question. What is the correct Ksp expression for the dissolving of Al(OH)3 (s)?   a.  Ksp = [Al3+] [OH-]3 b.  Ksp = [Al3+] [O2-]3[H+]3 c. Ksp = [Al3+]3 [OH-] d. Ksp = [Al3+] [OH-] e. Ksp = [Al3+] 3[OH-]

The Ksp of Ag2C2O4 is 3.5 x 10-11 . What is the solubility of Ag2C2O4(s) in moles per liter (mol/L) pure water? (Note: The molar mass of Ag2C2O4 is not needed in this problem, which asks for molesper L.) a. 4.2 x 10-6 mol/L b. 3.3 x 10-4 mol/L c. 2.1 x 10-4 mol/L d. 5.9 x 10-6 mol/L  e. 8.8 x 10-12 mol/L 

Which is the correct equation for 12956Ba decaying by electron capture?  a. 56129Ba  →  55129Cs +  +1 0e b. 56129Ba + -1 0e →  57 129La c. 56129Ba + -1 0e → 55129Cs d. 56129Ba → 57 129La + -1 0e e. 56129Ba → 54 125Xe + 2 4He

The Ksp of bismuth iodide, BiI3 [Molar Mass = 589.68], is 8.1 x 10-19. If BiI3 (s) is dissolved in pure water, what is the solubility in grams per liter (g/L)? (Suggestion: Write the dissolving equation and Ksp expression for BiI3 before starting this problem.) a. 3.1 x 10-7 g/L b. 7.8 x 10-3 g/L c. 1.0 x 10-2 g/L d. 1.3 x 10-2 g/L e. 1.8 x 10-2 g/L   Tables.pdf Periodic Table with New Elements.pdf

What [PO43-] is required to just begin precipitation of Zn3(PO4)2 (s) from a solution of 0.2 M Zn2+ (aq)? (Suggestion: Write the dissolving equation and Ksp expression for Zn3(PO4)2 before starting this problem.) a. 1.1 x 10 -30 M b. 2.1 x 10 -16 M c. 1.1 x 10 -15 M d. 5.3 x 10 -16 M e. 1.0 x 10 -16 M   Tables.pdf Periodic Table with New Elements.pdf

Use your CHM-132 Tables to calculate the Kb of ClO- .   a. 3.0 x 10-8 b. 3.3 x 10-7 c. 3.0 x 106 d. 3.0 x 10-22 e.  3.3 x 107

Determine the coordination number of Fe in the complex [Fe(en)2Cl2]+ , and then answer the following  question. What is the most likely molecular geometry of [Fe(en)2Cl2]+ ? a. linear b. tetrahedral c. square planar d. octahedral e. trigonal planar   Tables.pdf Periodic Table with New Elements.pdf

What is the solubility (in mol/L) of AgCl(s) in a solution that contains 0.05 M AgNO3 (aq)? (Suggestion: Write the dissolving equation and Ksp expression for AgCl before starting this problem.) a. 3.6 x 10-9 mol/L b. 1.3 x 10-5 mol/L c. 3.2 x 10-20 mol/L d. 2.8 x 108 mol/L  e. 143 mol/L   Tables.pdf Periodic Table with New Elements.pdf

Consider the following data for the reaction: A → products [A] Rate 0.02 M 6.91 x 10-4 M/min 0.05 1.73 x 10-3 0.12 4.15 x 10-3 What is the rate law? (Suggestion: first determine the order by the ratio technique.) a. Rate = k[A] b. Rate = k/[A] c. Rate = k d. Rate = k[A]2 e. Rate = k/[A]2   Tables.pdf Periodic Table with New Elements.pdf