The thiocyanate polyatomic ion, SCN-, is commonly called a pseudohalogen because it acts very much like halide ions. For example, we know that the pure halogens consist of diatomic molecules, such as Cl2. Thiocyanate ions form similar molecules in the following reaction:
2NaSCN + 2H2SO4 + MnO2 → (SCN)2 + 2H2O + MnSO4 + Na2SO4
a. Write a conversion factor that could be used to convert between moles of NaSCN and moles of (SCN)2.
b. How many moles of (SCN)2 form when 0.50 moles of NaSCN react completely?
c. What is the maximum number of moles of (SCN)2 that could form in the combination of 4 moles of NaSCN and 3 moles of MnO2?
d. Write a conversion factor that could be used to convert between moles of sulfuric acid, H2SO4, and moles of manganese(II) sulfate, MnSO4.
e. What is the minimum number of moles of H2SO4 that must react to form 1.7752 moles of manganese(II) sulfate?