In synthesis, it is generally desirable to have the reacting species in solution. When iron cations (either Fe2+ or Fe3+) are present, the manual instructs you to adjust the pH to a certain value around pH 4. What is the point here; that is, why is it "bad" to have iron cations in a basic solution? a. Basic solutions would result in the formation of insoluble iron hydroxides O b. Basic solutions reduce the Fe3+ to Fe2+ and we need Fe3+ at that point in the synthesis c. Basic solutions would favor C2042-, which would precipitate the iron too early d. Basic solutions result in a gelatinous green suspension, but we need it to be an orange solution Calculate the percents by mass of Fe3+ and of C2042- in K3[Fe(C204)3]-3H20. The molar mass of Fe3+ is the molar mass of C2042- is the molar mass of K3[Fe(C204)3].3H20 is The % by mass of Fe3+ is and the % by mass of C2042- is What is the mole ratio of C2042- to Fe3+ according to the formula K3[Fe(C204)3]3H20 ? a. 1 C2042- to 3 Fe3+ ob. 3 C2042-to 3 Fe3+ O c. 1 C2042- to 1 Fe3+ O d. 3 C2042- to 1 Fe3+