Chemistry · May / June 2021 · Paper 42 · Question 3
0620
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Sodium hydrogencarbonate is found in baking powder. When sodium hydrogencarbonate is heated it forms three products. 2NaHCO3 → Na2CO3 + H2O + CO2
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3(a)[1]
(thermal) decomposition
3(b)[4]
84 (1)
12.6 / 84 = 0.15(00) (1)
0.15(00) / 2 = 0.075(00) (1)
0.075(0) × 24.0 = 1.8 (1)
3(c)[2]
Ca(OH)2 (1)
CaCO3 (1)
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