Acid Potassium and Acid Sodium Phthalates as Standards in Alkalimetry and Acidimetry

Quite recently Francis D. Dodge suggested acid potassium phthalate and acid sodium phthalate as standards in alkalimetry and acidimetry. His paper contains no analytical data and is largely theoretical, and so far as the writer can determine no such data are available. The two substances have certain very desirable features as standards, which Dodge has pointed out. The question is whether they are true acid salts. It seemed to me a matter of interest to subject them to a somewhat rigorous examination to determine whether they can be relied upon to give accurate results in standardization