A student is asked to determine the value of K, for acetic acid by titration with potassium hydroxide.
The student begins titrating a 41.8 mL sample of a 0.444 M aqueous solution of acetic acid with a 0.346 M aqueous potassium hydroxide solution, but runs out of standardized base before reaching the equivalence point. The student's last observation is that when 21.0 milliliters of potassium hydroxide have been added, the pH is 4.525.What is K, for acetic acid based on the student's data?

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

we need the questions , i may then you.