ALBERT R. MANN LIBRARY New York State Colleges OF Agriculture and Home Economics Cornell University Cornell University Library QD 77.C59 Color chart of Indicators; reprinted from ORDER FROM 3 1924 002 972 200 WILLIAMS & WILKINS COMPANY PUBLISHERS OF SCIENTIFIC JOURNALS AND BOOKS BALTIMORE, U. S. A. iJ> 1 Explanation ^ ;j,i The colors shown upon the chart were reproduced from tubes 16 / ,' mm. internal diameter containing 10 CO. standard buffer solution. The quantities of indicator solutioa added in each case were as follows: Thjmiol blue, add range (T.B. acid range) .^ , . . . 1 cc. 0.04 p^r cent solution Brom phenol blue (B.P.B.) >............. O.S cc. 0.04 per cent solution Methyl red (M.R.) 0.3 cc. 0.02 per cent solution Brom cresol purple (B.C.P.) O.S cc. 0.04 per cent solution Brom thymol blue (B.T.B.) ..;. 0.5 ec. 0.04 per cent solution Phenol red (P.R.) .;..... , O.S cc. 0.02 per cent solution Cresol red (C.R.) - 0.5 cc. 0.02 per cent solution Thymol blue (T.B.)... O.S cc. 0.04 per cent solution > It must be remembered that the light adsorptions in the case of the standard solutions and in the case of the jirinted colors are quantitatively very .different in the two cases. Therefore, the user of the chart will have to use discretion and should consider the printed colors to be only rough standards. A more detailed discussion of this chart is given in the book from which the chart is reprinted — "The Determination of Hydrogen Ions" by W. Mansfield Clark. Price, net, postpaid One copy of the Chart. . ; $i;00 a copy Three Copies of the Chart. ....:... , . , ... .90 a copy Five copies af the Chart , i 75 a copy Ten copies of the Chart 65 a copy Fifteen copies of the Chart. , .... , .60 a copy Twenty-five copies of the Chart, or over .50 a copy Copyright 1921, by WiLUAMS & Whkins Co. Copyright 1922, by Weluams & Wilkins Co. Cornell University Library The original of tiiis book is in tine Cornell University Library. There are no known copyright restrictions in the United States on the use of the text. http://www.archive.org/details/cu31924002972200 ffl-S flj CO Q f^i?^.^» M a o o CO (S o c J o 02 P a Z ■< M IS O |i| o O o Q » O g O !E CO Eh LaMotte Standards FOR USE IN THE Colorimetric Determination of Hydrogen- Ion Concentration A— STANDARDIZED INDICATOR DYES : ' Supplied in both dry and solution form Common Name ■ Color change pff range THYMOL BLUE (acid ranfie) Red-YeUow 1.2-2.8 BROMPHENOL BLUE Yellow-Blue 3.(M.6 METHYL RED Red-Yellow 4.4-6.0 BROMCRESOL PURPLE Yellow-Purple 5.2-6.8 BROMTHYMOL BLUE Yellow-Blue 6.0-7.6 PHENOL RED YeUow-Red 6.8-8.4 CRESOL RED Yellow-Red 7.2-?.8 THYMOL BLUE (alkaUne ran£e) YeUow-Blue 8.0-9.6 CRESOL PHTHALEIN Colorless Red 8.2-J».6 PHENOL PHTHALEIN Colorless Red 8,*-9.2 B— STANDARDIZED BUFFER SOLUTIONS (M/5) POTASSIUM PHOSPHATE HYDROCHLORIC ACID POTASSIUM CHLORIDE SODIUM HYDROXIDE (COz FREE) POTASSIUM PHTHALATE DISODIUM PHOSPHATE 2H,0 POTASSIUM CHLORIDE— BORIC ACID MIXTURE Supplied in SOOcc and lOOOcc resistance glass containers C— BUFFER MIXTURES: Covering the range of pH 1.0-10.6 in integers of 0.2 pH. Firmished in lOcc ampoule sets and in standard lOOcc and SOOcc containers. D— COLOR STANDARDS: For comparing with unknowns, sets covering any part of the range from pH 1.0 to 10.0. Supplied in lOcc ampoule E--LaMOTTE H-ION COMPARATOR SET: A complete compact outfit for accurate determination of H-Ion concentration. Equally useful in both laboratory and field work. The set consists of comparator and case, color standards, prepared indicator, graduated test-tubes and pipette together with booklet containiag full instructions for use. LaMOTTE INDICATOR FIELD SET: For Use in determining the H-Ion concentration of Soils by the Wherry Method, also suitable for approximate adjustments in laboratory work. PURE CHEMICALS : A large number of general Synthetic and purified compounds are ■prepared by us and are supplied by us to many of the leading scientific institutions for use as primary steuidards. For pticea and literature address LaMotte Chemical Products Company STANDARDS DEPARTMENT 13 West Saratoga Street Baltimore, Md., U. S. A. For ChemistSf Metallurgists, Biologists, and Bacteriologists The Determination of Hydrogen Ions by W. Mansfield Clark, Ph.D. First Edition - - - - JSeptember, 1920 Reprinted - - - - - September, 1921 SECOND EDITION - - September, 1922 This treatise on the hydrogen electrodiB, indicator, and Bupplemerit^ry ndethods of determining hydrogen ion concentrations, with an indexed bijj- liography of eleven hundred references on applications, is an important con- tribution to the hterature in this field. "-'-- Are You Interested in analjrtical methods, in the acidity of your garden soil, in enzymes, in blood and the determination of acidosis, in modem methods of handUng protein solutions, in the cultivation and study of bacteria, yeasts, molds and tissue, in autolysis, hydrogeo iOn catalyses, colloids, thedigestive system, filtration, plajQt distribution, natural waters, the hydrogen ion concentration of biolog- ical fluids? If so, you will need the methods and references found in The Determination of Hydrogen Ions Numerous Illustrations Indicatcor Chart in Gjlora Price, net, postpaid! 113 V."^^^. ^*^*f^ ^f^*=°' ^?^ xtiv>c, ixcu, i'"'"'f»'^*)^ $5^25, Canada j $5.50, other coimtnes. MAY BE ORDERED FROM WILLIAMS & WILKINS^COMPANY PUBLISHERS OP SCIENTIFIC JOURNALS AND BOOKS - BALTIMORE. U. S. A.