Write out the stepwise \(K_{\mathrm{a}}\) reactions for citric acid \(\left(\mathrm{H}_{3} \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{O}_{7}\right)\), a triprotic acid.

The stepwise $K_{a}$ reactions for citric acid, a triprotic acid, are as follows: 1. First dissociation reaction: \[ H_{3}C_{6}H_{5}O_{7}(aq) \rightleftharpoons H_{2}C_{6}H_{5}O_{7}^{-}(aq) + H_{3}O^{+}(aq) \] with $K_{a1} = \frac{[H_{2}C_{6}H_{5}O_{7}^{-}][H_{3}O^{+}]}{[H_{3}C_{6}H_{5}O_{7}]}$ 2. Second dissociation reaction: \[ H_{2}C_{6}H_{5}O_{7}^{-}(aq) \rightleftharpoons HC_{6}H_{5}O_{7}^{2-}(aq) + H_{3}O^{+}(aq) \] with $K_{a2} = \frac{[HC_{6}H_{5}O_{7}^{2-}][H_{3}O^{+}]}{[H_{2}C_{6}H_{5}O_{7}^{-}]}$ 3. Third dissociation reaction: \[ HC_{6}H_{5}O_{7}^{2-}(aq) \rightleftharpoons C_{6}H_{5}O_{7}^{3-}(aq) + H_{3}O^{+}(aq) \] with $K_{a3} = \frac{[C_{6}H_{5}O_{7}^{3-}][H_{3}O^{+}]}{[HC_{6}H_{5}O_{7}^{2-}]}$