A sample of 25.00 mL of HCl(aq) was mixed with 25.00 mL of KOH(aq) of the same c

Question

A sample of 25.00 mL of HCl(aq) was mixed with 25.00 mL of KOH(aq) of the same concentration in a calorimeter. As a result, the temperature rose from 25.00 to 26.60oC. Given that Ho = -56.02 kJ for the reaction and that the heat capacity of dilute aqueous solutions is 75.4 J/oK mol, determine the molarity of the original HCl solution. (Assume the heat capacity of the calorimeter to be negligible.).

Explanation / Answer

_____Calorimetry HCl + KOH ----> KCl + H2O___dHrxn =-56.02 kJ/mole H+ or OH- heat generated = 4.184J/gC * (25 + 25)g * (26.60 - 25.00)C = ?? J moles of H+ = ?? J / 56020 J/mole H+ = ?? moles H+ M = ?? moles H+ / 0.025 liter = ?? M Plug and SOLVE Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.

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