Volumetric and acoustic studies of sucrose with ammonium phosphate salts, namely, ammonium dihydrogen phosphate (ADP) and diammonium hydrogen phosphate (DAP), have been carried out using an oscillating U-tube instrument, namely, Anton Paar DSA 5000 M. Densities and speeds of sound in aqueous solutions of sucrose and mixed aqueous solutions of (0.0, 0.5, 1.0, and 1.5) mol" kg(-1) ADP and DAP have been measured at four different temperatures (288.15, 298.15, 308.15, and 318.15) K and an experimental pressure of p = 0.1 MPa. Making use of the density and speed of sound data, the respective apparent molar volume (V-phi) and apparent molar isentropic compression (K-phi,K-s) in aqueous solutions of sucrose and mixed aqueous solutions of ADP and DAP have been determined at the above four temperatures.