Hcn is classified as a weak acid in water. this means that it produces
a. 100% of the maximum number of possible hydronium ions.
b. no hydronium ions.
c. a relatively large fraction of the maximum number of possible hydronium ions.
d. a relatively small fraction of the maximum number of possible hydronium ions.

D. a relatively small fraction of the maximum number of possible hydronium ions.

Explanation:

A weak acid is an acid that is partially dissociated into its ions in an aqueous solution or water. A weak acid is one that does not dissociate completely in solution; this means that a weak acid does not donate all of its hydrogen ions (H+) in a solution

It is produced when an Arrhenius acid dissolves in water. So a weak acid would form a relatively small fraction of the maximum number of possible hydronium ions while in contrast a strong acid would form a relatively large fraction of the maximum number of possible hydronium ions.

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