Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. it is an oxidizing agent that can directly kill many microorganisms; it decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. in the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. bao2(s) + 2 hcl(aq) h2o2(aq) + bacl2(aq) what amount of hydrogen peroxide should result when 1.49 g of barium peroxide is treated with 25.1 ml of hydrochloric acid solution containing 0.0279 g of hcl per ml? webassign will check your answer for the correct number of significant figures. 0.299 correct: your answer is correct. g what mass of which reagent is left unreacted? webassign will check your answer for the correct number of significant figures. 0.0367 incorrect: your answer is incorrect. g hcl bao2 correct: your answer is correct.