. Practical physical chemistry . Fig. be chosen of such a length that the air-space above the solution issmall. The capillary side tube B is connected with a Hempelgas burette, or ordinary burette, exactly as shown in Fig. 11, The mouth of the tube A is closed by a rubber stopperthrough which a stirrer, S, passes, and the latter is furnishedwith a mercury seal, M, to prevent the escape of gas. VELOCITY OF CHEMICAL REACTION 269 The construction of such a mercury seal, which is of greatvalue in physico-chemical work, will be readily understood fromFig. 91. Through the rubber stopper,
. Practical physical chemistry . Fig. be chosen of such a length that the air-space above the solution issmall. The capillary side tube B is connected with a Hempelgas burette, or ordinary burette, exactly as shown in Fig. 11, The mouth of the tube A is closed by a rubber stopperthrough which a stirrer, S, passes, and the latter is furnishedwith a mercury seal, M, to prevent the escape of gas. VELOCITY OF CHEMICAL REACTION 269 The construction of such a mercury seal, which is of greatvalue in physico-chemical work, will be readily understood fromFig. 91. Through the rubber stopper, R, there passes a tube,a, which is slightly wider than the stem of the stirrer S. Passingabout halfway through the rubber stopper is the moderatelywide tube d, which forms a cup round the tube a. Attachedby corks or rubber stoppers (rubber tubing) to the upperportion of the stem of the stirrer, are two tubes, c and d, theformer of which is of the same diameter as a, while the latterhas a width intermediate between that of a and 6. It shou
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