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The deprotonation of para-sulfonatocalix  arene was studied by a combination of spectrophotometric and potentiometric methods at 25 °C. The ionic strength of the solutions was kept constant by sodium perchlorate as a background electrolyte at 0.10-4.0 mol dm -3 . The spectral changes evidenced proton dissociation of only one hydroxyl group of calixarene in the studied pH range of 2-10. The pK a values were calculated using the STAR program by multivariate curve resolution of the absorbancedoi:10.2298/jsc120706110f fatcat:wup4uspzsfbijapf47hfwtuwy4