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Chapter 11: Q33P (page 260)

Finding the End Point with a pH Electrode

11-33What is a Gran plot used for?

Short Answer

Expert verified

The gran plot used to locate the end point of the titration by using the data right before the equivalence point

Step by step solution

01

Titration of Diprotic Systems

  • Titration of a diprotic acid with a specified quantity of NaOH solution
  • Diprotic acid's molecular weight (or molar mass) is expressed in grams per mole.
  • You can determine the original acid sample's mass in grams by weighing it.
  • The volume of NaOH titrant required to achieve the first equivalence point can be used to calculate moles.
02

Determine the gran plot used for

Gran plot is used to locate the end point of the titration by using the data right before the equivalence point, for example from 0.8Veor 0.9Veup to Ve.

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Most popular questions from this chapter

In-1Spectrophotometry with indicators.* Acid-base indicators arc themselves acids or bases. Consider an indicator. HIn. which dissociates according to the equation

HIn鈬�KaH++In-

The molar absorptivity,. is role="math" localid="1654932356442" 2080M-1cm-1for HIn and 14200M-1cm-1for In-1. at a wavelength of 440 nm.

(a) Write an expression for the absorbance of a solution containing HIn at a concentration [HIn] and role="math" localid="1654932619574" In-1at a concentration role="math" localid="1654932655635" In-in a cell of pathlength 1.00 cm. The total absorbance is the sum of absorbances of each component.

(b) A solution containing indicator at a formal concentration of role="math" localid="1654931801074" 1.84脳104-Mis adjusted to pH 6.23and found to exhibit an absorbance of 0.868 at 440 nm. Calculate pKa for this indicator.

Question:Effect of concentration in the titration of weak acid with strong base.Use your spreadsheet from Problem 11-66 to prepare a family of titration curves for pKa = 6, with the following combinations of concentrations: (a) Ca = 20 mM, Cb = 100 mM; (b) Ca = 2 mM, Cb = 10 mM; (c) Ca = 0.2 mM, Cb = 1 mM.

Distinguish the terms end point and equivalence point.

What is the pH at the equivalence point when 0.100M hydroxyacetic acid is titrated with 0.0500M KOH?

The Kjeldahl procedure was used to analyze 256 mL of a

solution containing 37.9 mg protein/mL The liberated NH3 was

collected in 5.00 mL of 0.033 6 M HCl, and the remaining acid

required 6.34 mL of 0.010 M NaOH for complete titration. What is

the weight percent of nitrogen in the protein?
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