printed) Name e. Clearly question you do not wish to be graded ial temperature o

Question

printed) Name e. Clearly question you do not wish to be graded ial temperature of both solutions is 23.0 °C. The final temperat he same as for water. (density 1,00 g/mL; specific heat 4.184 Ja crese hequestion S on this page or question 6 on the next page, C cross out the 3 3s O mt of a 0.500 M HCI soludionis mied with 50.0 mL of a 0.500 M NaoH 5 250ml on ad sluldons is 2 C Assume that the densities and specific heats ofe solution are the same as a) Identify the limiting reagent b) Calculate the concentration of NaCl in the final solution. c) What is the AH of the reaction on a molar basis?

Explanation / Answer

The reaction between HCl and NaOH is given by

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

1mole HCl = 1mole NaOH

Given that, HCl = 25mL and 0.500 M

NaOH = 50 mL and 0.500 M

Volume of NaOH > volume of HCl. Thus HCl is the limiting reagent

b) 25ml of 0.50 M HCl reacts with 25mL of 0.50 M NaOH and forms 0.50 M of NaCl in a total of 50 mL solution

Concentration of NaCl = 0.50 moles in 75 mL so concentration of NaCl becomes 0.5*0.75

[NaCl] = 0.375 M

c) q = m*C*(dT) = 75g*4.184*(23-27.2) = 1317.96 J = 1.317 KJ/mole

m = total volume of solution = 25+50 = 75g

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