If there is more than one deliquescent substance present in a mixture of solids, ... At f NaCl/Sucrose > 0.25 Clegg’s model predicts an increase followed by a decrease of water activity but does not fit the experimental points. Pure NaCl is not deliquescent. @sunil:very good attempt.we appreciate your contriution to this forum.you deserve thumbs up from experts. Post an Answer. CaCl 2 is deliquescent while NaCl is hygroscopic. Why is impure NaCl deliquescent while pure NaCl is not? yes, nacl is hygroscopic in nature. This is the major difference between these two closely related terms. I'm not too sure about NaCl, but I don't believe that it is either. Theoretically, the solid is pure NaCl (as is the case for any 2-phase system with starting composition m NaClO 4 /(m NaClO 4 + m NaCl) < 0.95); therefore, the solid might be a poor template for crystallization of a solution containing NaClO 4. In Chemistry 5 Answers Available Asked by Blake on 30th April, 2020 To get notifications when anyone posts a new answer to this question, Follow New Answers. Basically, anything that is deliquescent is also hygroscopic. vry easy eg. But table salt is deliquescent due to Magnesium Chloride(MgCl2) impurities. Hygroscopic substances become wet while deliquescent substance dissolve after absorbing moisture. It will be deleted. Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. NaCl is deliquescent, hygroscopic or efflorescent? Sodium chloride is hygroscopic, which is why salt cellars / salt shakers become jammed as it sticks together in humid weather. - 3984541 Figures 1–5 show the model calculations of relative humidity and solution composition from 90 to 120°C versus X NO3 or X Na for the NaCl–NaNO 3–H 2O, the KNO 3–NaNO 3–H 2O, and the NaCl–KNO 3–H 2O systems. that are saturated with respect to the same deliquescent min-erals. 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