Gypsy_chem
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When 10 cm3 of 1.0 mol dm−3 hydrochloric acid is added to 5.0 cm3 of0.50 mol dm−3 sodium hydroxide in a polystyrene cup, the temperature rises by 2.3 °C.HCl(aq) NaOH(aq) 􀁯 NaCl(aq) H2O(l)The temperature rise when 10 cm3 of 1.0 mol dm−3 hydrochloric acid is added to20 cm3 of 0.50 mol dm−3 sodium hydroxide isA 18.4 °C.B 9.2 °C.C 4.6 °C.D 2.3 °C.
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BDavies1
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In expt 2, 4 x the number of moles react (compared to expt 1), so 4 x the amount of heat energy is transferred. However, this is transferred into 2 x volume (30 cm3 in expt 2 and 15 cm3 in expt 1) so the temp rise is only 2 x bigger.
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