Soluble or Insoluble

Students of class II investigated “Is salt soluble in different liquids like cooking oil , vinegar and water” .The students observed and dissolved salt in vinegar ,Cooking oil  and water . Students observed and concluded that salt was soluble in water and vinegar but insoluble in cooking oil. The investigation was made a fair test by using same quantity of salt in all three different liquids.Students did this investigation to find out insoluble solids in different liquids.