chem 2

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indictae the reactant that is a bronsted lowry acid.

HCN(aq) +H2O (l)---> H3O+(aq)=CN-(aq)

HCN
CN-
H20
H30

i think it is HCN the weak acid substance which acts as a proton (H+) donor and CN the weak base?

You are right. The HCN donates the proton (to H2O) so that makes HCN the Bronsted acid and CN^- is its conjugate base. H2O in the equation is the Bronsted base and H3O^+ is its conjugate acid.

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