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Solubility and Ionic Strength (Fry-Petit)

Last updated

Oct 24, 2020
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- Size Exclusion Chromatography (Liu)
- Solubility and Ionic Strength (Scott)

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Analytical Sciences Digital Library

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Reading: Chapter 12 (sections 1-2)

Homework: Chapter 12: 2, 4, 5, 9-13.b, 14-19

Solubility,IonicStrength.png

What was the effect of NaI on the solubility of PbI₂? Why?

$\ce{PbI_{2(s)} ⇆ Pb^2+ + 2I-}\nonumber$

What is the effect of adding KNO₃ to the above rxn? Why?

STOP

NewEquilibrium,pHEquations.png

What is the ionic strength of a 0.00333 M solution of PbI₂ and the activity coefficient of Pb²⁺ and I^-?

STOP

Calculate the solubility of 0.00333 M PbI₂ (K_sp 7.9×10^-9) solution with 2 different scenarios.
- Assume PbI₂ solubility is low enough not to effect ionic strength.
- Assume PbI₂ solubility effects ionic strength.
- How does the solubility differ and how can you explain the difference?

STOP

Calculate the ionic strength and solubility of a saturated solution of 0.0125 M PbI₂ with 0.05 M NaCl. Assume PbI₂ solubility effects ionic strength.
- Calculate the ionic strength
  
  STOP
- Interpolate to determine the $γ_{Pb^{2+}}$ and $γ_{I^-}$
- Determine the solubility

Contributors and Attributions

Allyson Fry-Petit, California State University Fullerton (afry@fullerton.edu)
Sourced from the Analytical Sciences Digital Library

Contributors and Attributions

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