The pH value of soda is above 7, normally between 7-8.5, where there are special features of soda between 7.8-9. Soda is an aqueous solution of sodium bicarbonate, which is weakly alkaline. Soda can be formed naturally or made by machines or with weakly alkaline effervescent tablets. In addition to sodium bicarbonate, natural soda contains a variety of trace element components, so it is also commonly used to make multi-flavored beverages with a mixture of sweeteners and flavors.