$\text{Fe}{(\text{CN})}_{\frac{6}{2}}^{}x\text{Na}({\text{NH}}_4^{}){\text{HPO}}_4^{}\stackrel{\mathrm{\Delta <!--\; \Delta \; -->}}{\to }{({\text{NaPO}}_3^{})}_x^{}+x{\text{NH}}_3^{}\uparrow <!--\; \uparrow \; -->+x{\text{H}}_2^{}\text{O}$