Enthalpy Change -Khco3

THE CALCULATION OF THE ENTHALPY CHANGE FOR DECOMPOSITION OF KHCO3 This question is accustomed to you to develop and practice some planning and analytical skills onwards an assessed practical. KHCO3, like NaCO3 in baking powder, decomposes to give the metal carbonate + carbon dioxide. The equation for the response is: 2KHCO3(s) ↠K2CO3(s) + CO2 (g)+ H2O(l) It is impossible to valuate this at once, but a Hess honor round can be established which allows its practical measurement. It involves adding hydrochloric superman to both replyants and products. Some selective information for the experiments is given below: 1.Reaction of KHCO3 with 30cm3 of 2M HCl crowd together of KHCO3 apply = 3.42g Temperature dip = 7.35oC 2.Reaction of K2CO3(s) with 30cm3 of 2M HCl Mass of K2CO3(s) used=2.58g Temperature rise=6.4oC Analysis 1.Work bulge out(p) the Mr of KHCO3 and K2CO3 and then the moles of them used in the experiments. 2.Work out the come alive transfigures in the calorimeter (ignore the masses of solids added in each case). You may scoop out that the specific heat capacity of the solutions is 4.18 Jg-1k-1. 3.Construct a Hess Law cycle to link KHCO3 and K2CO3 to the products formed when HCl reacts with them both. 4.Being careful to disturb the moles actually used in the equations correct, calculate the enthalpy of decay for potassium hydrogen carbonate.

The answer is between +90 and + snow kJ for the reaction as written at the top of the page. An try on prep and Design Background: The enthalpy change fo r the decomposition reaction of atomic num! ber 11 hydrogencarbonate cannot be incurd directly: 2NaHCO3(s) ↠Na2CO3 + H2O(l) + CO2(g) However, both sodium hydrogencarbonate and sodium carbonate will react with dilute hydrochloric acid: NaHCO3(s) + HCl(aq) ↠NaCl(sq) + H2O(l) + CO2g) Na2CO3(s) + 2HCl(aq) ↠2NaCl(aq) + H2O(l) + CO2(g) Task: Design an experiment to determine the enthalpy change for the...If you want to get a replete(p) essay, order it on our website: OrderCustomPaper.com

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