. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. HYDROGEN ION CONCENTRATION AND PROTEOLYSIS. 151 of paralfine for each piece of apparatus were placed. Thus it was possible to obtain a perfect insulation. In preparing the different parts of the apparatus extreme care should be exercised to obtain an accurate result. The method for the preparation of the normal element, calomel electrode, gas cell, and also calibration of the biidge wire, ^ etc., is described in detail in Findlay's "Practical Phj's- /^p paral u3 fcmPLOVCD in Delerminolion of H- Ion De
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. HYDROGEN ION CONCENTRATION AND PROTEOLYSIS. 151 of paralfine for each piece of apparatus were placed. Thus it was possible to obtain a perfect insulation. In preparing the different parts of the apparatus extreme care should be exercised to obtain an accurate result. The method for the preparation of the normal element, calomel electrode, gas cell, and also calibration of the biidge wire, ^ etc., is described in detail in Findlay's "Practical Phj's- /^p paral u3 fcmPLOVCD in Delerminolion of H- Ion Desckiption of Diagram. f\l\ Li — Lippmann's capillarimeter. L2 — Tungsten lamp. A — Accumulator. N — Western normal element. Si — Switch with quick short circuiting key. S2 — Three-way switch. S 3— Two-way switch. C — Calomel electrode. K — Concentrated KCl cup. G — Gas cell. B —Bridge. P — Thick glass plate. ical ; Every contact should be carefully made, so that accu- rate leadings can be obtained. It is worthy of mention that the diffusion potential between n/10 KCl calomel electrode and the solution to be tested is reduced by interposing the saturated solution of KCl as it is indicated by K on the diagram. For the standardization of the electrode it was first platinized with general precaution; then the hydrogen ion concentration of the mixed solution (7 c. c. of m/15 KH2PO4, 3 c. c. of m/15 Na2 HPO4) 2 was determined at different intervals. After the read- ings became constant there was a difference of volts between the theoretical data and the results obtained. ' The author is greatly indebted to Professor Thompson, department of physics, Amherst College, for his kind advice. ' Sorensen's standard Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wor
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