Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Chapter 6, Problem 6.26P
Interpretation Introduction

Interpretation:

  • Table for initial and final concentration of Na+,OH-and NaOH in 1F Sodium hydroxide has to be prepared.
  • At equilibrium the fraction of Na in the form of NaOH(aq) has to be calculated.

Expert Solution & Answer
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Answer to Problem 6.26P

Table for initial and final concentration of Na+,OH-and NaOH is

Na++OH-NaOHInitialconcentration:110Finalconcentration:1x1xx_¯

The fraction of Na in the form of NaOH(aq) is 6.85 or 0.15

Explanation of Solution

Given

Li++OH-LiOH(aq)K1=0.83Na++OH-NaOH(aq)K1=0.20

To prepare: table for initial and final concentration of Na+,OH-and NaOH

Na++OH-NaOHInitialconcentration:110Finalconcentration:1x1xx_¯

To calculate: fraction of Na in the form of NaOH(aq)

Concentration = [NaOH][Na+][OH_]=x(1-x)2x = 0.15Mx = 0.2 - 0.4x + 0.2x20.2x2-1.4x+0.2=0x=-b±b2-4ac2a=1.4±1.42-4(0.2)(0.2)2(0.2)= 6.85or0.15

Conclusion

Table for initial and final concentration of Na+,OH-and NaOH was given as,

Na++OH-NaOHInitialconcentration:110Finalconcentration:1x1xx_¯

The fraction of Na in the form of NaOH(aq) was calculated as 6.85 or 0.15

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