Chemistry IA Exemplar: To what extent does a single thin layer of acrylic paint coating prevent the tarnishing of metal substrates (10cm2 of Zn(s) and Mg (s) and 15cm2 Fe(s)), after being submerged in 20cm2 of saltwater solution (5.99 mol/dm³) for 72 hours, as measured by the comparison of the increase in conductivity (μS/cm)? | RevisionDojo