3. Explain what is meant by the term \"equivalence point.\" How you will determi
ID: 541300 • Letter: 3
Question
3. Explain what is meant by the term "equivalence point." How you will determine the equivalence point when you perform a colorimetric titration? How you will determine the equivalence point when you perform a pH (potentiometric) titration? 4. What specific piece of data can be determined from a pH (potentiometric) titration that cannot be determined from a colorimetric titration? 5. For the strong acid-strong base colorimetric titrations in this experiment, what solution will you place in the buret and what solution will you place in the Erlenmeyer flask below the buret? To which of these two solutions you will add the phenolphthalein indicator? 6. Using a volumetric pipet, a student transferred 25.00 mL of 0.1085 M HCl into a clean and dry 125-mL Erlenmeyer flask. Calculate the number of moles of HCl in the flask 7. Calculate the number of moles of HCl in the flask described in question 5 after the addition of 15.00 mL of water to the original 25.00 mL of solution. Calculate the concentration (in M) of the HCl solution after the addition of 15.00 mL of water 8. A vinegar solution of unknown concentration was prepared by diluting 10.00 mL of vinegar to a total volume of 50.00 mL with deionized water. A 25.00 mL sample of a diluted vinegar solution required 20.24 mL of 0.1073 M NaOH to reach the titration equivalence point Calculate the concentration of acetic acid (in M) in the original vinegar solution (before dilution) 9. In a titration of a monoprotic weak acid with sodium hydroxide, the pH at the half- equivalence point is 4.37. What are the values of pKa and Ka for the acid?Explanation / Answer
The equivalence point or stoichiometric point of a chemical reaction in titration is the point or concentration of added titrant which is stoichiometrically equal to the amount of moles of analyte in given sample.
Or at the equivalence point is point the fraction added stoichiometric amount of titrant to the titrated substance equals exactly .
In colorimetric the chemical which shows completion of reaction by colour change called indicator are used. They reflect the end point which is supposed to be equivalence point.
In potentiometric titratione quivalence point is determined by titration curve .
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