Question

In an acid-base titration, 40.0 ml. of H2SO, was completely neutralized by 20.54 mL of a 0.708 mol/L KOH solution. a) Write the complete balanced equation for this reaction (to be submitted with written work). b) Calculate the molar concentration of H,SO Your Answer: Answer units Question 8 (1 point) In the reaction of paraffin wax with oxygen: C25 H52(s) + 38 O2(g) → 25 CO2(g) + 26 H2O(g) + the Energy energy released by the reaction is called the enthalpy of a) Formation b) Vaporization Od Combustion d) Decomposition e) None of the above

Answer 1

The given reaction is an acid base reaction. The complete balanced equation for this reaction is as shown below.

H2SO4 (ago + 2KOH caqs kopcast a Hoo (1)

I believe that the question asked is to calculate the molar concentration of H2SO4 and not H2SO3. I believe it is a typographic error in the question.I have read H2SO3 as H2SO4 and done the calculations.

It is understood from the reaction that one mole of H2SO4 requires 2 moles of KOH for the complete neutralization or in other words one mole of KOH neutralizes 1/2 mole of H2SO4. The equation used for the calculation of concentration in a titration is

ax Nasou x Vyson = Moon * You. М. Nuse - NKou * Уком , , Given Nkon =0.708 molla. Vkov - Q-5ч ть so - цо-от-. On substitution 99.5ч /. 108 [email protected], Кso. 2 но си, очно со. #5% mo\ь. concentration of it, so e. Molar is 0.253 mol/L or in

The 1/2 comes in the equation from the 1:2 stoichiometry of KOH and H2SO4 in the complete neutralization.

Q8. It is the reaction of paraffin with oxygen to form only CO2 and H2O. This process is called combustion. Hence the energy released is called enthalpy of cumbustion.