Grade premium grade first grade qualified product \nindex \nname of index \ntotal acidity(hcl) %≥ 31 31 31 \nfe %≤ 0.002 0.008 0.01 \nsulphates(so4) %≤ 0.005 0.03 — \nas %≤ 0.0001 0.0001 0.0001 \nignition residue %≤ 0.05 0.1 0.15 \nfree chlorine(cl) 0.004 0.008 \nspecifications \nhydrochloric acid 35 % \ntechnical grade \nspecifications: \nhydrochloric acid is a clear, colorless to slightly yellow liquid with a sharp, pungent and irritating order. it is a strong highly corrosive acid, soluble in water and alcohol but insoluble in