Salt solubility versus temperature

Solubilities of six salts in grams per 100 g of water from 0 to 100 °C, with their enthalpies of solution at infinite dilution. Salts with a positive enthalpy of solution become more soluble on warming.


Potassium nitrate	$\ce{KNO3}$	13.300	31.600	63.900	110.000	169.000	246.000	34.89
Sodium nitrate	$\ce{NaNO3}$	73.000	87.300	104.100	123.700	147.500	176.200	20.50
Ammonium chloride	$\ce{NH4Cl}$	29.400	37.200	45.800	55.200	65.600	77.300	14.78
Potassium chloride	$\ce{KCl}$	27.600	34.000	40.000	45.500	51.100	56.700	17.22
Sodium chloride	$\ce{NaCl}$	35.700	36.000	36.600	37.300	38.400	39.800	3.88
Calcium hydroxide	$\ce{Ca(OH)2}$	0.189	0.173	0.153	0.128	0.099	0.066	−16.70

Ca(OH)₂ has measured values only at 0, 20 and 100 °C; 40–80 °C are monotone interpolations. Modern CRC data agree with the classic series to within about 2 %.

Sources

W. M. Haynes (ed.), CRC Handbook of Chemistry and Physics, 97th ed. (2016): aqueous solubility of inorganic compounds at various temperatures; enthalpy of solution of electrolytes (V. B. Parker, NSRDS-NBS 2, 1965).
A. Seidell, Solubilities of Inorganic and Organic Compounds, 2nd ed. (1919) — the classic series reprinted in the 人教版 grade-9 chemistry textbook.

Used in these lessons

Forming solutions and solubility