The densities, ρ, apparent molar volumes, V2, ϕ, speeds of sound, u and apparent molar isentropic compression, Ks,2, ϕ° of ascorbic acid in water and in aqueous [DEEA][Pro] solutions at temperatures, T = (293.15 to 328.15) K and at ambient pressure.

amB is the molality of [DEEA][Pro] in water.bm is the molality of ascorbic acid in water or water + [DEEA][Pro] solutions.cρo is the density of [DEEA][Pro] in water.duo is the speed of sound of [DEEA][Pro] in water.The standard uncertainties are u (T) = 0.01 K, u(m) = 1.03·10−5 mol·kg−1, u(ρ) = 7.0·10−3 kg·m−3, u (u) = 0.5 m·s−1, u (P) = 0.05 kPa. The combined uncertainties, U are U (Vϕ) = (0.20 to 0.04)·106 m3·mol-1 and U (Ks2,ϕ) = (0.60 to 0.12)·10−15 m3·mol-1·Pa-1 for low and high concentration range of ascorbic acid, respectively (level of confidence, k = 0.95). The experiment was conducted under atmospheric pressure.The densities, ρ, apparent molar volumes, V2, ϕ, speeds of sound, u and apparent molar isentropic compression, Ks,2, ϕ° of ascorbic acid in water and in aqueous [DEEA][Pro] solutions at temperatures, T = (293.15 to 328.15) K and at ambient pressure.