Sodium hydrogencarbonate decomposes on heating to form sodium carbonate. It is d

Question

Sodium hydrogencarbonate decomposes on heating to form sodium carbonate. It is difficult to measure the enthalpy change of this reaction directly. 2NaHCO 3 (s) Na 2 CO 3 (s) + CO 2 (g) + H 2 O(l) One method of determining this enthalpy change is to react known amounts of sodium hydrogencarbonate and sodium carbonate, separately, with excess dilute hydrochloric acid. (a) 0.010 mol of solid sodium hydrogencarbonate was added to 25 cm 3 of dilute hydrochloric acid. A temperature rise of 11 °C was measured using a thermometer graduated at 1 °C intervals. (i) Calculate the heat energy produced by this reaction using the equation: Energy transferred in joules = mass × 4.18 × change in temperature

Explanation / Answer

Assume that volume of solution = volume of water = 25 mL

Mass of water = 25 g.                                                         ( density of water = 1 g / mL)

Heat transfer = m * s * change in temperature

q = 25 * 4.18 * 11

q = heat energy produced = - 1149.5 J

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