Procedure and observations
Take about 50 galactose and 50 mg glucose separately in different test tubes Add 1 ml of water and 1 ml conc HNO3 to each tube. Heat the tubes in boiling water bath for 1.5 h. Add 5 ml water and keep them over night. Insoluble mucic acid will be formed in the case of galactose but not glucose or other sugars.