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pH AND HYDROGEN-ION CONCENTRATION 635 wherein pKi has the value 6.4 and represents the first dissocia- tion constant of carbonic acid, a is the absorption coefficient of C02, 0.759 at 25 C., and Pcoz is the partial pressure of carbon dioxide in the gas at equilibrium. It is seen that the effect of the factor u is to decrease pH, therefore neutral salts can increase the actual acidity; the actual acidity increases with titrable alka- linity, because the latter is due to an acid salt, the bicarbonate. In this and other formulas, log means the logarithm with its proper sign, not reversed; the form to be used is 1.57, for ex- ample. REFERENCES (1) Batson, D. M., and Frances 0. Batson. 1945 A simple method for conversion of fractional ^H values, The Chemist-Analyst, 34, 54-56. (2) Britton, H. T. S. 1932, Hydrogen-ions. Their determination and importance in pure and industrial chemistry, D. Van Nostrand & Co., Inc. New York. (3) Kolthoff, I. M. 1931, The colorimetric and potentiometric determina- tion of pH, John Wiley & Sons, Inc. New York. NEW FACULTY MEMBERS AT EARLHAM COLLEGE Dr. David Telfair, former research physicist with the Monsanto Chemi- cal Company, and Joachim Jaenicke, former teacher at Westtown Friends School, Westtown, Pa., will become members of the Earlham college facul- ty next fall, it was announced by President Thomas E. Jones. Dr. Telfair, a graduate of Earlham in 1936, will teacher higher mathe- matics and will assist Dr. George D. VanDyke in the physics department. Mr. Jaenicke will teach history. Mr. Jaenicke was born in Germany 33 years ago and spend the first 18 years of his life there. His father was for eleven years governor of Lower Silesia, and later a member of the Reichstag. In 1933 he resigned his posi- tion and went as a League of Nations advisor to the Chinese National Government, and Mr. Jaenicke received his high school training in Shang- hai. In 1935, the elder Mr. Jaenicke and Mrs. Jaenicke returned to Europe, but because of the political situation in Germany, they lived in complete retirement in southern Germany. At the present time, the elder Mr. Jaenicke is again active, serving as State Commissioner for refugees, responsible for the settlement in Bavaria of a million and a half Germans expelled from eastern Europe. The younger Mr. Jaenicke, who did not return to Germany with his parents, studied in France, at Geneva, Switzerland, and at The Hague. He also did research work in Paris. In 1939 he came to America, where he studied at Haverford college, and later at the Fletcher School of Law and Diplomacy at Medford, Mass. Since 1941 he has been a teacher at Westtown Friends School, teaching German, French, and History.

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pH AND HYDROGEN-ION CONCENTRATION 635

wherein pKi has the value 6.4 and represents the first dissocia-tion constant of carbonic acid, a is the absorption coefficient ofC02, 0.759 at 25° C., and Pcoz is the partial pressure of carbondioxide in the gas at equilibrium. It is seen that the effect of thefactor u is to decrease pH, therefore neutral salts can increasethe actual acidity; the actual acidity increases with titrable alka-linity, because the latter is due to an acid salt, the bicarbonate.In this and other formulas, log means the logarithm with itsproper sign, not reversed; the form to be used is �1.57, for ex-ample.

REFERENCES

(1) Batson, D. M., and Frances 0. Batson. 1945 A simple method forconversion of fractional ^H values, The Chemist-Analyst, 34, 54-56.

(2) Britton, H. T. S. 1932, Hydrogen-ions. Their determination andimportance in pure and industrial chemistry, D. Van Nostrand & Co.,Inc. New York.

(3) Kolthoff, I. M. 1931, The colorimetric and potentiometric determina-tion of pH, John Wiley & Sons, Inc. New York.

NEW FACULTY MEMBERS AT EARLHAM COLLEGE

Dr. David Telfair, former research physicist with the Monsanto Chemi-cal Company, and Joachim Jaenicke, former teacher at Westtown FriendsSchool, Westtown, Pa., will become members of the Earlham college facul-ty next fall, it was announced by President Thomas E. Jones.

Dr. Telfair, a graduate of Earlham in 1936, will teacher higher mathe-matics and will assist Dr. George D. VanDyke in the physics department.Mr. Jaenicke will teach history.Mr. Jaenicke was born in Germany 33 years ago and spend the first 18

years of his life there. His father was for eleven years governor of LowerSilesia, and later a member of the Reichstag. In 1933 he resigned his posi-tion and went as a League of Nations advisor to the Chinese NationalGovernment, and Mr. Jaenicke received his high school training in Shang-hai. In 1935, the elder Mr. Jaenicke and Mrs. Jaenicke returned to Europe,but because of the political situation in Germany, they lived in completeretirement in southern Germany. At the present time, the elder Mr.Jaenicke is again active, serving as State Commissioner for refugees,responsible for the settlement in Bavaria of a million and a half Germansexpelled from eastern Europe.The younger Mr. Jaenicke, who did not return to Germany with his

parents, studied in France, at Geneva, Switzerland, and at The Hague.He also did research work in Paris.

In 1939 he came to America, where he studied at Haverford college, andlater at the Fletcher School of Law and Diplomacy at Medford, Mass.Since 1941 he has been a teacher at Westtown Friends School, teachingGerman, French, and History.