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Baking power is a mixture containing sodium hydrogencarbonate and a solid acid,HA.(a)(i)Why should baking powder be stored in a dry place?(ii)Write an equation for the reaction between sodium hydrogencarbonate and the acid HA.(iii)Suggest why sodium hydrogencarbonate is used in baking cakes.(b)Give one use of... 顯示更多 Baking power is a mixture containing sodium hydrogencarbonate and a solid acid,HA. (a)(i)Why should baking powder be stored in a dry place? (ii)Write an equation for the reaction between sodium hydrogencarbonate and the acid HA. (iii)Suggest why sodium hydrogencarbonate is used in baking cakes. (b)Give one use of sodium hydrogencarbonate in first aid process.

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(a) (i) Moisture in air dissolve HA and reacts with sodium hydrogencarbonate. Then, it will be useless. (a) (ii) NaHCO3(aq) + HA(aq) -> H2O(l) + CO2(g) + NaA(aq) (a) (iii) CO2 released in the reaction can raise the dough and make the cake spongy. (b) Treat acid burn.

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