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${\displaystyle {\mathsf {H_{3}PO_{4}+2\,KOH\ {\xrightarrow {}}\ K_{2}HPO_{4}+2\,H_{2}O}}}$

${\displaystyle {\mathsf {H_{3}PO_{4}+K_{2}CO_{3}\ {\xrightarrow {}}\ K_{2}HPO_{4}+CO_{2}\uparrow +H_{2}O}}}$

${\displaystyle {\mathsf {KH_{2}PO_{4}+KOH\ {\xrightarrow {}}\ K_{2}HPO_{4}+H_{2}O}}}$

${\displaystyle {\mathsf {2\,K_{2}HPO_{4}\ {\xrightarrow {250^{o}C}}\ K_{4}P_{2}O_{7}+H_{2}O\uparrow }}}$

${\displaystyle {\mathsf {K_{2}HPO_{4}+H_{3}PO_{4}\ {\xrightarrow {}}\ 2KH_{2}PO_{4}}}}$

${\displaystyle {\mathsf {K_{2}HPO_{4}+KOH\ {\xrightarrow {}}\ K_{3}PO_{4}+H_{2}O}}}$

${\displaystyle {\mathsf {2\,K_{2}HPO_{4}+3\,AgNO_{3}\ {\xrightarrow {}}\ Ag_{3}PO_{4}\downarrow +3\,KNO_{3}+KH_{2}PO_{4}}}}$