Qualitative Analysis of Mg2+, Ca2*, Ba2*, and A1³+ lons Prelaboratory Assignment 1. Complete the following flow diagrams by filling in the boxes with the correct cations or precipitates. a. Initial separation of cations: b. Enter all 4 cations Precipitate 6 M NH,, 6 M HCI Identification of cation from Group III: 6 M NaOH Precipitate from part a 6 ANH, Solution 6 M HCI