I found this about bitter taste of baking soda.
Quote:
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Baking soda is basic and will yield a bitter taste unless countered by the acidity of another ingredient, such as buttermilk. You'll find baking soda in cookie recipes. Baking powder contains both an acid and a base and has an overall neutral effect in terms of taste.
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http://chemistry.about.com/cs/foodch...f/blbaking.htm
Anne