How many teaspoons in 500 grams of baking soda?

Baking Soda (Sodium Bicarbonate) as a density of 2.20 g cm−3

1 Teaspoon [metric] = 5 cubic centimeters.

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Therefore 20 grams will have a volume of (20/2.2) = 9.090909090909091 cubic centimeters.

Thus 9.090909090909091/5= 1.818181818181818 Teaspoons

Thus roughly 2 Teaspoons would do.