Question: How does baking powder differ from baking soda? Answer: Baking soda is a single compound which has sodium hydrogen carbonate which is alkaline (basic) in nature Baking powder is a mixture of sodium hydrogencarbonate and a mild edible(eatable) acid such as tartaric acid. When baking powder mixes with water, then the sodium hydrogencarbonate reacts with tartaric acid to evolve carbon dioxide gas which gets trapped in the wet dough and bubbles out slowly making the cake to rise and hence 'soft and spongy'.The equation which takes place can be shown as: NaHCO 3 + H + ----> Na + + CO 2 + H 2 O Question: What will happen if heating is not controlled while preparing Plaster of Paris from gypsum? Answer: It may be noted that the temperature should be controlled carefully. It should not be allowed to rise above 152°C (425K) because, if whole of the water is lost then anhydrous calcium sulphate is produced, which is called dead burnt plaster and it
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