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Chapter 11: Q35P (page 261)

Prepare a second derivative graph to find the end point from the following titration data.

Short Answer

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Step by step solution

01

Excel sheet regarding calculation

The calculation in excel sheet for determining the 2nd derivative is shown below

02

Graph

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Most popular questions from this chapter

Question:Titrating weak acid with weak base.

(a) Prepare a family of graphs for the titration of 50.0 mL of 0.020 0 M HA (pKa = 4.00) with 0.100 M B (pKb = 3.00, 6.00, and 9.00).

(b) Write the acid-base reaction that occurs when acetic acid and sodium benzoate (the salt of benzoic acid) are mixed, and find the equilibrium constant for the reaction. Find the pH of a solution prepared by mixing 212 mL of 0.200 M acetic acid with 325 mL of 0.050 0 M sodium benzoate.

Derive the following equation for the titration of potassium hydrogen phthalate (K+HP-) with NaOH:

ϕ=CbVbCaVa=αHP-+2αP2--1-[H+]-[OH-]Ca1+[H+]-[OH-]Cb

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

HIn⇌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" 1.84×104-Mis adjusted to pH 6.23and found to exhibit an absorbance of 0.868 at 440 nm. Calculate pKa for this indicator.

Would the indicator bromocresol green, with a transition range of pH 3.8–5.4, ever be useful in the titration of a weak acidwith a strong base?

Calculate the pH at each point listed for the titration of 50.0 mL of 0.050 0 M formic acid with 0.0500 M KOH. The points to calculate are , 10.0, 20.0, 25.0, 30.0, 40.0, 45.0, 48.0, 49.0, 49.5, 50.0, 50.5, 51.0, 52.0, 55.0, and 60.0 mL. Draw a graph of pH versus Vb.
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