Question: what is sodium carbonate powder?
Answer: Sodium carbonate commonly occurs as a crystalline decahydrate (Na2CO3·10H2O), which readily effloresces to form a white powder, the monohydrate (Na2CO3·H2O). Pure sodium carbonate is a white, odorless powder that is hygroscopic (absorbs moisture from the air) and that forms a moderately basic solution in water.