Potentiometric Titration of Strong Acid with Strong Base

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What is the main purpose of potentiometric titration?

To determine the concentration of an unknown analyte without using a chemical indicator

What does pH measure in a solution?

The concentration of hydrogen ions

Why is potentiometric titration considered more reliable than titrations using chemical indicators?

It does not rely on visual color changes in the solution

What is the volume of NaOH used at the end point in the procedure?

The volume at which the solution changes to pink

What type of titration is potentiometric titration classified as?

Acid-base titrations (neutralization titrations)

What is the purpose of washing the electrode with D. W. and drying it before immersing it in the buffer solutions?

To ensure accurate pH measurements by removing any impurities on the electrode surface

In the titration process, why is it important to add smaller volumes of NaOH towards the equivalence point?

To achieve a more precise determination of the equivalence point

Why is the shape of the graph between pH and volumes of NaOH typically like shape (A)?

It represents the characteristic S-shaped curve of a titration involving a strong acid and a strong base

What is the main reason behind considering HCl a strong acid?

HCl dissociates completely into ions in aqueous solution

Why is it important to record the values of pH for the mixture in the beaker after each addition of NaOH during titration?

To monitor the progress of the reaction and identify the equivalence point

What is the purpose of immersing the electrode in buffer solutions with pH 4 and pH 9 before recording the pH value of the HCl solution?

To calibrate the pH meter and ensure accurate pH measurements

Why is it recommended to add larger volumes of NaOH towards the end of the titration, just before the pH stops rising markedly?

To accurately determine the endpoint of the titration

What does the plot of pH against volumes of NaOH look like during the titration process according to the text?

An initial increase, then a plateau, and finally a steep increase

Why is HCl considered a strong acid?

It completely dissociates into ions in solution

How can the molarity of the HCl solution be calculated from the titration data?

By finding the volume of NaOH at the equivalence point

Learn about the laboratory method of potentiometric titration to determine the concentration of an unknown analyte without using a chemical indicator. Understand how pH or electric potential measurements are used to determine the equivalent point in the process.

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