Nickel (II) Chloride (NiCl2), Calcium Chloride (CaCl2) are each deliquescent substances, though CaCl2 is considerably more deliquescent. Here, CaCl2 swiftly picks up moisture to form a saturated solution, in which NiCl2 spontaneously codissolves upon contact.

Some solubilities, deliquescent relative humidities:
CaCl2: 81.3 g/100 mL (25 °C) (DRH 29.5%) [ Ссылка ]
NiCl2: 67.5 g/100 mL (25 °C) (DRH 53 %) [ Ссылка ]

Salt hydrate pair equilibria:
CaCl2·H2O = CaCl2 + H2O(g) (RH 0.007%)
CaCl2·2H2O = CaCl2·H2O + H2O(g) (RH 126%)
CaCl2·4H2O = CaCl2·2H2O + 2H2O(g) (RH 7.1%)
CaCl2·6H2O = CaCl2·4H2O + 2H2O(g) (RH 27.7%)
NiCl2·2H2O = NiCl2 + 2H2O(g) (RH 1.3%)
NiCl2·4H2O = NiCl2·2H2O + 2H2O(g) (RH 24 +/- 1 %)
NiCl2·6H2O = NiCl2·2H2O + 2H2O(g) (RH 54 %)

What else do we see? 👀🔬

If you want to see some of my theoretical work in chemistry, see for example:
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To attend our research seminar on autocatalysis, visit:
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