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How would you distinguish between baking powder and washing soda by heating?

Posted by Ankish Trivedi 6 years, 2 months ago

CBSE > Class 10 > Science

2 answers

Inayat Khan 6 years, 2 months ago

Bakingsoda is used to make baking powder

0Thank You

Yogita Ingle 6 years, 2 months ago

The production of carbon dioxide is main characteristic of baking soda that makes it suitable for baking.

Baking soda gives carbon dioxide and water vapour on heating at even low temperature such as 100°C. The gas so formed turns lime water milky, which confirms the presence of carbon dioxide gas

.2NaHCO₃ + Heat → Na₂CO₃ + CO₂ + H₂O

When Washing soda (Na2CO3) is heated it does not produce carbon dioxide even at high temperature, such as 200°C or 300°C. However sodium carbonate gives sodium oxide and carbon dioxide when heated at about 1000°C

Na₂CO₃.10H₂O + Heat → Na₂CO₃+ 10H₂O

The gas produced by heating of the samples can be checked by passing through lime water. If the lime water turns milky then the evolved gas is carbon dioxide and the heated substance is baking powder.

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CBSE > Class 10 > Science