4. (4 pts) In this lab, you will be performing a conductometric titration. In th

Question

4. (4 pts) In this lab, you will be performing a conductometric titration. In this titration, the conductivity of a solution will be continuously monitored as a second reactant is added to cause a precipitation reaction to take place. The equivalence point of this precipitation will be reached when a sudden change is observed in the solution conductivity. Be sure to look up any terms you are unfamiliar with. For this type of conductometric titration, what is the equivalence point telling you about the precipitation reaction? Note: The accuracy of your response will be graded on this question. Be sure to think carefully about your response and seek high-quality, scientific outside resources to properly answer the question. Your reference(s) must be properly cited using ACS citation style. Any response copied from a website that discusses acid-base behavior will likely be counted completely incorrect- this lab uses a titration involving a precipitation reaction

Explanation / Answer

Titration is the a method of determining the concentration of an unknown solution (the analyte) by reacting it completely with a standardized reagent that is a solution of known concentration (the titrant). The point at which all of the analyte is consumed is the equivalence point. The conductivity of a solution is dependent on several factors, including the concentration of the solute, the degree of dissociation of the solute, the valence of the ion(s) present in the solution, the temperature, and the mobility of the ions in the solution.

Let us take an example...to understand clearly...

(1) Ba2+ (aq) + 2 OH- (aq) + 2 H+ (aq) + SO42- (aq) BaSO4 (s) + H2O (l)

The barium sulfate, BaSO4, is fairly insoluble and precipitates out of solution. The hydronium and hydroxide ions combine to form water. Neither of the reactant products contribute very much to the conductivity of the solution, thus as the titration takes place the conductivity will decrease. At the equivalence point, when enough H2SO4 has been added to react with the available Ba(OH)2, the conductance of the analyte is at it’s lowest point. Adding more titrant will cause the conductance of the analyte to increase again.

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.