Chemical name sodium carbonatemolecular weight 105.989melting point 851oc 1564ofspecific gravity 20o4oc 2.533specific heat 25oc 0.249 calgmoc77of 0.249 btulboc45oc 0.256 calgmocheat of fusion 854oc 75.5 calgm135.9 btulbheat of formation 25oc -2550 calgm-4590 btulbheat of hydration monohydrate, na2co3 h2o 30.0 calgm na2co354.0 btulb na2co3heptahydrate, na2co3 7h2o 156.4 calgm na2co3281.5 btulb na2co3decahydrate, na2co3 10h2o 208.8 calgm na2co3375.8 btulb na2co3solubility 0oc 7 gms na2co3 in 100 gms h2o100oc 44.7 gms na2co3 in 100 gms h2o35.37oc (max.) 49.5 gms na2co3 in 100 gms h2oalkali equivalent 100 % na2co3 = 58.48 % na2oacid equivalent 1 lb na2co3 = 0.6881 lb hcl.