Compound

Water activity

30˚C

40˚C

50˚C

KOH

0.074

0.063

0.057

CH₃COOK

0.216

0.204

0.192

MgCl₂

0.324

0.316

0.305

K₂CO₃

0.432

0.432

0.433

Mg(NO₃)₂

0.514

0.484

0.454

NaNO₂

0.635

0.616

0.597

NaCl

0.751

0.747

0.744

KCl

0.836

0.823

0.812