Potassium Hydrogen Phthalate Acidimetric Standard Crystal Reagent Special ACS Inorganic Ventures ICP Single-Component Standards Test Specification Min Max ASSAY

Test Specification Min Max ASSAY 19 21 % (w/v) TRACEABLE TO NIST APPEARANCE EXPIRATION DATE DATE OF MANUFACTURE

0002 meq RETEST DATE

Test Specification Min Max APPEARANCE WHITE POWDER WHITE POWDER

50% ARSENIC (As) 1 ppm ELEMENTAL IMPURITIES AS REPORTED IDENTIFICATION TO PASS TEST RETEST DATE DATE OF MANUFACTURE CERTIFIED KOSHER APPEARANCE RESIDUAL SOLVENTS TO PASS TEST

Test Specification Min Max DYE CONTENT APPROX

Potassium Hydrogen Phthalate Acidimetric Standard Crystal Reagent Special ACS Inorganic Ventures ICP Single-Component Standards Test Specification Min Max ASSAYTest Specification Min Max ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % ASSAY (C[@8@]H[@5@]O[@4@]K) 99. 95 100. 05 % 99. 95 100. 05 % pH OF A 0. 05M SOLUTION @ 25[dC 4. 00 4. 02 4. 00 4. 02