code: def dens_pacl_solution(ConcAluminum, temp):
      
      return ((0.492 * ConcAluminum * PACl.MolecWeight
               / (PACl.AluminumMPM * MOLEC_WEIGHT_ALUMINUM)
               ) + pc.density_water(temp).magnitude
              )
docs: Return the density of the PACl solution.
  
      From Stock Tank Mixing report Fall 2013:
      https://confluence.cornell.edu/download/attachments/137953883/20131213_Research_Report.pdf