Freely soluble in water; sparingly soluble in alcohol; insoluble in fixed oils.
A. Dissolve 0.5 gm in 5 ml of water, acidify with hydrochloric acid; and filter the resulting precipitate. Wash the precipitate with water and, dry it over silica gel for 5.0 hrs: The infrared absorption spectrum of a mineral oil dispersion of it exhibits maxima only at the same wavelengths as that of a similar preparation of usp Methyl Paraben RS.
B. Ignite about 0.3 gm, cool, and dissolve the residue in about 3 ml of 3N hydrochloric acid. A platinum wire dipped in this solution imparts an intense, persistent yellow colour to a non-luminous flame.
Between 9.5 and 10.5, determined in a 0.1% w/v solution, appendix 8.11