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25 cm3 of 1 M lead(II) nitrate solution was added to 50 cm3 of 1 M hydrochloric acid and a precipitate was formed. The original solutions had a temperature of 18.9 ºC which on mixing rose to 20.7 ºC. Write down full and ionic equations for the reaction and calculate the enthalpy change. What is limiting the accuracy of the result? Specific heat capacity of water = 4.18 J g-1 K-1.