. Practical physical chemistry . :—Experiment.—Determine the Relative Strengths of Hydro-chloric and Sulphuric Acids. A standard solution of. baryta, approximately — should 20, be prepared (p. 162), and its litre determined by means of pure succinic acid, using phenol- phthalein as indicator. By means of this baryta solution, prepare also semi - normal solutions of hydrochloric acid and sulphuric acid, the solutions being in all cases made up with COa-free water (p. 161). Procure also two small Erlenmeyer flasks of about 40-50 capacity, preferably made of Jena glass. These should be washe
. Practical physical chemistry . :—Experiment.—Determine the Relative Strengths of Hydro-chloric and Sulphuric Acids. A standard solution of. baryta, approximately — should 20, be prepared (p. 162), and its litre determined by means of pure succinic acid, using phenol- phthalein as indicator. By means of this baryta solution, prepare also semi - normal solutions of hydrochloric acid and sulphuric acid, the solutions being in all cases made up with COa-free water (p. 161). Procure also two small Erlenmeyer flasks of about 40-50 capacity, preferably made of Jena glass. These should be washed clean, and then subjected to the action of steam for 10-15 minutes (p. 170), and thereafter dried; and they should also be fitted with corks, previously soaked in melted paraffin, and be weighted by means of leaden plates. The latter may be attached to the flasks either by turning up the edges of the lead round the flask, or by means of thin copper wire passing through the corners of the lead plate and twisted round the. Fig. 89. 26o PRACTICAL PHYSICAL CHEMISTRY neck of the flask; or a band of lead may be made to encirclethe lower portion of the flask (Fig. 89). Procure, further, one or two Erlenmeyer flasks of capacity, fitted with corks, in which to carry out thetitrations; two pipettes, the one made to deliver i , theother to deliver 2 ; and a small stoppered bottle with puremethyl acetate. Into the two small Erlenmeyer flasks, prepared as described n n above, pipette 20 of the --HC1 and --H2SO4 respectively, and place them in a thermostat, the temperature of which has beenadjusted to 25*0° (p. 71). The flasks may be either suspendedfrom the side of the thermostat or placed on a tray of strongwire-netting or perforated zinc plate, which should be placedat such a depth that the flasks are immersed up to the neckin the water of the thermostat. The bottle containing themethyl acetate should also be placed in the thermostat. After, say, ten minute
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