an aldehyde + A + H2O <=> a carboxylate + AH2 + H(+)
an aldehyde + a + h2o <=> a carboxylate + ah2 + h(+)
an aldehyde + A + H2O <=> a carboxylate + AH2 + H(+)
an aldehyde + a + h2o <=> a carboxylate + ah2 + h(+)