state the basicity of each of the following

(a)HCOOH (b)H3PO4 (c)HNO2 (d)CH3CH2COOH

(a) HCOOH - weak acid, weak base

(b) H3PO4 - weak acid, weak base
(c) HNO2 - weak acid, weak base
(d) CH3CH2COOH - weak acid, weak base