How much Fe3+ from ferrihydrite would dissolve at pH 2 and 7? How much Fe3+ from goethite would dissolve at pH 2 and 7?

Consider the series of equilibrium reactions below. In which way would you expect the reaction to “tend” at high pH?  What about low pH?  Why? Circle the Fe(III) species that you’d expect to be least soluble.   Fe3+ + OH- <---> FeOH2+ + OH- <---> Fe(OH)2+ + OH- <---->Fe(OH)3(ferrihydrite) + OH- <--->Fe(OH)4-

Which metal sulfides can be precipitated from a solution that is 0.0020 M in Mn2+, 0.0030 M Zn2+, 0.00200 M Na+ and 0.0200 M Cu2+ and 0.0050 M in O2- ? Metal Sulfide Ksp MnO 4.0×102 ZnO 2.6×10-4 CuO 5.0×10-10 Na2O 1.0×10-9

A sample of an iron ore was prepared for Fe3+ analysis as following: 3.4g of the sample was added anddissolved in acid environment then diluted to 250 mL using volumetric flask. After that, 10 mL of the resultingsolution was transferred by pipet to a 50-mL volumetric flask and continue to be diluted. The scientists foundout that this solution gives the concentration of Fe3+ as 2.3 mg/L. Find the weight percentage of Fe3+ in theoriginal sample.

Consider the metal ions below. Which metal ion(s) below would you expect to form a colorless solution? 1. ZrA+ 2. Fe3+ 3. Ti2+ 4. Zn2+ 5. Pb2+ O 4 only O 1,4 and 5 O 1 only O 1, 2 and 4 O 2 and 3 O 2 only O 3 only