Titrations of Weak Acids and Bases Related to Nitroguanidine JOHN E. DE VRIES, SIDNEY SCHIFF, and E. ST. C L A I R G A N T Z Ana/ytica/ Chemistry Branch, u.S. N a v a l Ordnance Test Station, China Lake, Calif. The acidic and basic character of nitroguanidines and related compounds was studied bq titration with sodium methoxide in dimethj lformamide and ethq 1enediamine and hq titration with perchloric acid in trifluoroacetic acid. In the basic solvents, azo violet was satisfactorq as a visual indicator. The strength of the acids could not be differentiated potentiometrically (antimonq-calomel electrode s! stem) although the pK,'s ranged from 8.1 to 12.40. 4 platinum-platinum electrode sjstem was used for titrations in trifluoroacetic acid. Excellent titrations were obtained for nitroguanidine in trifluoroacetic acid.
H E use of various acidic and basic
