Question

What happens when baking powder and washing soda is heated?

Answer 1

Baking soda (NaHCO3) on heating produces carbon dioxide (CO2), which extinguishes a burning matchstick. But washing soda (Na2CO3.10H2O) on heating does not produce any such gas, thus, it has no effect on burning matchstick.

Answer 2

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ujjwaljaswal111

Secondary SchoolChemistry 5+3 pts

How would you distinguish between baking powder and washing

soda by heating?

NCERT Class X

Science - Exemplar Problems

Chapter_Acids, Bases and Salts

Report by NoelRajan324 28.05.2015

Answers

ujjwaljaswal111

Ujjwaljaswal111 · Ambitious

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syedaleemuddin

Syedaleemuddin Ace

Answer: 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