. Practical physical chemistry . R XIV DETERMINATION OF SOLUBILITY The property of forming solutions or homogeneous mixturesof varying composition, is a very important one, and is metwith in all three physical states of matter, gaseous, liquid,solid. Of the different possible kinds of solutions, the mostimportant are those formed by the solution of a gas in aliquid, of a liquid in a liquid, and of a solid in a liquid. Solubility of a Gas in a Liquid The solubility of a gas in a liquidcan readily be determined by meansof the apparatus shown in Fig. 96,except in those cases where the gasis very
. Practical physical chemistry . R XIV DETERMINATION OF SOLUBILITY The property of forming solutions or homogeneous mixturesof varying composition, is a very important one, and is metwith in all three physical states of matter, gaseous, liquid,solid. Of the different possible kinds of solutions, the mostimportant are those formed by the solution of a gas in aliquid, of a liquid in a liquid, and of a solid in a liquid. Solubility of a Gas in a Liquid The solubility of a gas in a liquidcan readily be determined by meansof the apparatus shown in Fig. 96,except in those cases where the gasis very soluble (ammonia, hydrogenchloride, etc). In its essential parts,the apparatus consists of a gas meas-uring burette A, connected with alevelling tube B. The burette isfurnished with a three-way tap awhich connects, on the one side, withthe gas supply, and on the other,with a tube leading to the absorp-tion pipette C, also furnished withthe three-way tap b and an ordinarytap I,. Care should be taken in selecting these taps to see. Determination of solubility 29S that they fit closely. The gas burette and absorption pipetteare connected by a length of lead or, preferably, of coppertubing of narrow bore (about i mm.). This tubing is bestwound into a spiral, so as to give flexibility to the apparatus,and allow of the absorption pipette being shaken. For the purpose of joining the glass and metal tubes, thefollowing device can be employed. To the metal tube issoldered a piece of brass tubing about 2 incheslong, and sufificiently wide to take the glass tube(Fig. 97). A quantity of sealing wax or hardpitch is melted inside the brass tube and the glasstube then inserted, so that the end of the metalcapillary passes inside the glass tube. If neces-sary, the joint can be further strengthened by anexternal coating of sealing wax. Before carrying out a determination, the volumeof the absorption pipette between the two tapsmust first be determined by means of water ormercury. For the solubi
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