High School Chemistry . ese are sometimescalled haloid acids, and the salts which they form, haloidsalts; they are thus distinguished from salts and acidswhich contain oxygen. 2.—Experiments with Chlorine. 1. Into a test-tube put one part of manganese dioxide,two parts of salt, and three of sulphuric acid. Fit thetest-tube with a cork and delivery tube. Heat smell the gas that comes off. Note its colour. 2. To prepare the gas on a larger scale, take a 4 oz. Florence flask and place init about 20 grams of man-ganese dioxide and 100 strong hydrochloric fittings
High School Chemistry . ese are sometimescalled haloid acids, and the salts which they form, haloidsalts; they are thus distinguished from salts and acidswhich contain oxygen. 2.—Experiments with Chlorine. 1. Into a test-tube put one part of manganese dioxide,two parts of salt, and three of sulphuric acid. Fit thetest-tube with a cork and delivery tube. Heat smell the gas that comes off. Note its colour. 2. To prepare the gas on a larger scale, take a 4 oz. Florence flask and place init about 20 grams of man-ganese dioxide and 100 strong hydrochloric fittings similar to thosein Fig. 40. Apply a verygentle heat. The deliverytube should pass almost tothe bottom of the jar. Fillseveral jars, taking carethat little or none of the ^° **^ gas escapes into the room. Place a wet glass cover over each jar. Afterwards passthe gas into a flask perfectly ///// of water; in aboutten minutes place this flask aside for future use. Smellthe water. The decompositions, which result in free. EXPERIMENTS WITH CHLORINE. 15; chlorine being formed in the first of these experiments,may be represented by the following equations :— MnO,+2NaCI + 3H,SO, = MnSO, + 2XaHSO,+ 2Cl. This occurs in two steps thus : NaCl+H,SO,=NaHSO,+ HCl2HCl+MnO,+ H,SO,=-MnS04+2CI+2H,0. If these reactions go on together, there are being pro-duced at the same time nascent oxygen, hydrogen andchlorine ; of these the oxygen and hydrogen unite andthe chlorine remains free. The sum of these two reac-tions is indicated in the first equation. The reaction that occurs in the second experimentmay be represented as follows : — MnO,-f4HCl = MnCl,-|-2H,0+2Cl. 3. Take the flask full of chlorine water, prepared inthe last experiment, and fit it witha cork and tube. The outer end ofthe tube must be drawn to a finepoint. Insert the cork so that thereis not a bubble of air left in theflask. Invert the flask as in Fig. 41,and expose to direct sunlight for aday. Then place the flask on thetable,
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