Synthetic Inorganic Chemistry

POTASSIUM NITRATE 53

on their solubilities, which may vary much or little with the
temperature. The following table gives the solubility at different

GRAMS OF SALT SOLUBLE IN 100 GRAMS OF WATER

At 10° At 100°

KNO 3 21 246

NaCl 36 40

KC1

NaNO 3

31

81

56

180

KNO,

50°

Temperature 100"

VABIATION OP SOLUBILITY WITH TEMPERATURE

temperatures for each salt. Thus, at 10°, 21 grams of KN0 3 are
soluble in 100 grams of water. This means that, if an excess of
solid potassium nitrate is shaken with pure water until no more
will dissolve, the clear solution will then contain 21 grams of
KN0 3 for every 100 grams of water. On the other hand, if a
solution of 42 grams of KN0 3 in 100 grams of water obtained at a