CHEM 104 Lecture Notes - Lecture 26: Solubility Equilibrium, Ionic Compound, Equilibrium Constant

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23 Jul 2018

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Ex: fe2s3 (s) 2fe3+ (ag) + 3s2- (ag) * solubility and solubility product constant are not the same thing * Solubility = the amount of solute per unit volume of solution (mol/l) that dissolved to form a saturated solution. Solubility product constant = the equilibrium constant for the chemical equilibrium that exists between a solid ionic solute and its ions in a saturated solution. Ex: ag+ and cl- = 6. 3 x 10-6 m. Ksp = [ag+] [cl-] = [6. 3 x 10-6] [6. 3 x 10-6] = 4. 0 x 10-11. * this process may seem straightforward to calculate the solubility of an ionic compound from its ka. * ionic salts such as pbcl2 dissociate stepwise, so that pbcl+ ions as well as pb2+ and cl- ions are present. * ion pairs, such as pbcl+ cl- can exist, reducing the concentrations of unassociated. * the solubilities of some solutes, such as metal hydroxides, depend on the acidity or alkalinity of the solution.

Related Questions

This is for the lab practical I take on Tuesday night. If you could answer each one and show your work/ explain that'd be amazing so I can do well on the actual practical on Tuesday! Thank you!

Chemistry 211 Lab Final Study Guide Spring 2015

Useful Information:
1 ampere =coulomb/sec
Faradayâs constant = 96,500 coulombs/mole of electrons
Molar mass of Au = 197.0 g/mole, Molar mass of Cu = 63.55 g/mole
m = moles , ' â

c kg

ÎTf

= Tf

â Tf

where Tf is for the pure solvent and Tf

is for the mixture.

ÎT = (K

)(m ) ,

m = (

(mass of

solute, g )
)( ).

f f c

c molar

mass, g

mol â1

mass of

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7. Next question

(a) If you weigh 6.355 grams of copper, add concentrated nitric acid to dissolve it, and then dilute the solution to a total volume of 50 mL, how many moles of copper are in this solution?

(b) For the equilibrium reaction 3H2(g) + N2(g) â 2NH3(g), what is the equilibrium constant expression, Kc, for this reaction? (5pts)

8. Suppose at some temperature, the equilibrium concentration of H2 is 0.45M, the equilibrium concentration of N2 is 0.38M, and the equilibrium concentration of NH3 is 0.42M. What is the value of the equilibrium constant for the reaction 3H2(g) + N2(g) â 2NH3(g) at this temperature? (Show your work. No credit will be given if your work is not shown.)

9. Next question
(a) If you need 0.0534 moles of NaOH to reach equivalent point in the titration with acetic acid, how many mL of 0.09876M NaOH will you need?

(b) The Ksp of Cu(OH)2 is 2.2x10-20, what is the solubility of Cu(OH)2?

10. Next question
(a) In non-sulfide qualitative analysis of representative cations, the Group A cations comprising of Pb2+,

Hg2+, and Ag+ give a precipitate with solution.
(b) From a solution containing mixture of Pb2+, Fe3+, and Al3+, Pb2+ is removed by adding HCl solution. To the remaining cation mixture, on making the solution basic with NH3 (pH=9 â 10), both the cations form precipitate. Further analysis of the cation mixture containing Fe3+ and Al3+ is carried out by adding NaOH solution.

Aluminum hydroxide (dissolves/remains undissolved) in NaOH solution while Ferric hydroxide ( dissolves/remains undissolved).
(c) Fe(OH)3 precipitate is dissolved in minimal amount of aqueous HCl which gives a

yellow solution. To this solution addition of solution (at pH = 4 â 5) yields a dark blue solid known as Prussian Blue.

(d) Describe the method for checking for completeness of precipitate in qualitative analysis of ions.

an observed rate las is: rale-kNo1cL1, doubling the concentration of NO and halving the concentration of Cl will have what effect on the reaction rate? ,5 49. The half-life or%Te aradi isotope commonly used in (A) increase the rate by a factor of eight (B) leave the rate unchanged (C) double the rate nuclear medicine, is abot 6 hours. How much of . 5.0 ug sample remains afher 2 days? (A) 002g ()06 (C og (D) 3W Which compound has the highest molar solubility in a 50. (D) halve the rate neutral solution? 46. The rate of consumption of CHe is 045 Ms' Whatis production of H0 . (B) BaCO, K-26 10 (C) Fe(OHh. K-2.810 the rate of (A) 0.15 Ms (C) 1.35 M-s Which energy diagram best matches an exothermic (B) 0.45 M-s (D) 2.70 Ms 51. Which will change the value of Kg for silver sride, AgN,? (A) Adding water to the solution (B) Adding silver ions to the solution. (C) Removing azide ions from the solution (D) 47. reaction with this mechanism? E+S ES (Fast) ES E+P Slow) Increasing the temperature of the solution 52. If solid NayPOs is added to a saturated aqueous solution of CalPO h what will happen to the concentration of in solution? (A) It will decrease. (B) It will increase (C) It will be unchanged (D) It will become equal to the PO," concentration Reaction Progress â 53. A solution contains 0.002 M Pb and 0,002 M Ag'. What happens when NaCl(s) is added to bring PoC 1.2-10 LAC1-1.8x10" the chloride ion concentration to 0.01 M? (A) Neither PbCl, nor AgCl precipitate B) Both PbCl, and AgCl precipitate. (C) PbCl, selectively precipitates. (D) AgCI selectively precipitates. Reaction Progress â Reaction Progress â 48. The graph shows E the change in concentration with time for two chemical species. Which balanced equation and value of the For Agl, the Ko value is 8.5x101" and for [Ag(C (A) Agl is completely insoluble in a solution th (B) Agl is less soluble in water than in a solu (C) Agl is more soluble in water than in a (D) Agl is equally soluble in water and i x) 54. Kr value is 1.0x10h. Which statement is true? 0 2468 0 time (min) contains CN equilibrium constant is consistent with the data? Equation Equilibrium Constant K,= 16 (B) X-2Y contains CN t on the internet

CHEM 104 Lecture Notes - Lecture 26: Solubility Equilibrium, Ionic Compound, Equilibrium Constant

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