Hydrochloric acid (analytical pure) reagent is 500g/bottle. The reagent used for analysis and determination has very few impurities, which will not hinder the analysis and determination. Analytical reagent is a kind of purity specification of chemical reagent. Its label is golden red, and it is used for important analysis and general research work. Analytical pure concentrated hydrochloric acid is prepared in 1:1 ratio, and its molar concentration should be 6mol/L hydrochloric acid is an aqueous solution of hydrogen chloride, which is colorless and transparent liquid.