Write the dissociation reaction and the corresponding ka equilibrium expression for each of the following acids in water. (use the lowest possible coefficients. omit states-of-matter in your answer. equilibrium expressions take the general form: ka = [h+] . [a-] / [ha]. subscripts and superscripts that include letters must be enclosed in braces {}.) (a) hcn dissociation reaction and equilibrium expression (b) hoc6h5 dissociation reaction and equilibrium expression (c) c6h5nh3+ dissociation reaction and equilibrium expression.