| Summary: | Density (ρ ± 10−3 kg m−3), sound velocity (VS ± 10−2 ms−1) as acoustic property and refractive index (μri ± 10−4) for 0.01–0.1 m K2Cr2O7, K2HPO4, KMnO4, KH2PO4, KCl, and KOH aqueous salts with compressibility attained with ion–solvent interaction (ISI) are reported at 0.01 interval and 293.15 K. Ionic internal pressure generated with ISI is expressed as adiabatic compressibility (β, pa−1) with relative change (Δβ/β0) and apparent molal compressibility (ϕk, m2N−1) with specific ionic activities for metallic and non-metallic anions. Linear regression generated VS0, μri0, ϕk0, and β0 as limiting data for analysis of speed of light and sound. The VS0 as KH2PO4 > K2HPO4 > KOH > K2Cr2O7 > KCl > KMnO4 denoted a minimum VS0 metallic anions. With concentrations, the sound velocity and refractive index are noted as ISI functions where the sound and light waves were in opposite trends. The Mn0 and Cr0 transitional metals with anions of the K2Cr2O7 and KMnO4 have affected the compressibility as K2Cr2O7 > KMnO4 due to 2Cr+6. The VS0, μri0, ϕk0, and β0 analyzed their ionic strengths in comparison to HPO4-, H2PO4-, Cl−, and OH− as non-metallic anions considering the interactions as sensors. A molionic model of ion–water interaction was proposed to generalize ion-molecular interactions in industrial mixtures.
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