Label each of the following as being a strong acid, a weak acid, or a species with

Question:

Label each of the following as being a strong acid, a weak acid, or a species with negligible acidity. In each case write the formula of its conjugate base, and indicate whether the conjugate base is a strong base, a weak base, or a species with negligible basicity:
(a) HCOOH,
(b) H2,
(c) CH4,
(d) HF,
(e) NH4+.