Question

State the chemical property in each case on which the following uses of baking soda are based 1) as an antacid 2) as a constituent of baking powder

Answer 1

as an antacid;-it is a mild non corrosive base so it is an ingrident of antacids 
as an constituent of baking powder:-baking powder is the mixture of sodium hydrogencarbonate and a mild edible acid so for the formation of baking powder baking soda is required. 

Answer 2

as an antacid- it being a base neutralizes the excess acid produced in our body

as an constituent of baking - it helps in rising up the dough in baking