The key difference between trisodium phosphate and tripotassium phosphate is that the trisodium phosphate has three sodiumcations associated with one phosphate anion while tripotassium phosphate has three potassium cations associated with one phosphate anion. Further, the difference between trisodium phosphate and tripotassium phosphate in appearance is that the trisodium phosphate appears as white granules whereas, the tripotassium phosphate appears as a white deliquescent powder.
Trisodium phosphate and tripotassium phosphate are ionic salts that have cations and anions associated with each other. These anions attract cations via electrostatic interactions. The anion of these two compounds is phosphate anion (PO43-). It is a tribasic anion which is capable of holding three cations with it.
