Circle Day: MTWRE Complete and submit this page to your lab instructor at the be

Question

Circle Day: MTWRE Complete and submit this page to your lab instructor at the beginning of the lab session Show all calculations in detal. This is an individual activity Lab 11 Thermodynamics (rev 111016) a) Write the balanced equation for the reaction occurring between aqueous solutions of HCI and NaOH to produce water and sodium chloride, then write the complete ionic and net ionic equations: Balanced Equation (molecular equation) Complete ionic equation Net lonic equation- label the states, (aq). etc. b) Use the net ionic reaction only, and calculate the enthalpy of the reaction( (AHe) using the following nAHproducts-InaHreactanti, where n is the number of moles, or the coefficient formula in the net ionic equation. The table below shows some the net ionic equation to do your calculations. "The standard enthalpy of the H'(ag) ion is zero. Substance State Check the species if it is Total for your net ionic aHran in your net ionic eqn. HCI H20 -92.3 -241.8 H2O | |-285.8 240.3 -411.2 aq-230.0 Na" 0. NaC OH- Cl- Clz -167.1 0. ag 0 NaC1-1-41 1.21 NaOH s+425.6

Explanation / Answer

Molecular equation:

HCl + NaOH ------->NaCl + H2O

total ionic equation

H+(aq) + Cl-(aq) + Na+(aq) + OH-(aq) ----->Na+(aq) + Cl-(aq) + H2O(l)

net ionic equation

remove common ions (spectator ions) from both side

H+(aq) + OH- -------->H2O(l)

b)

Hrxn = sum of enthalpy of formation of products - {sum of enthalpy of reactants}

= -241.8 x 1 mol - {-230.0 x 1mol + 0 x 1mol} = -11.8 kJ

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