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Chapter 7: Q23P (page 159)

The text claims that precipitation of l-is not complete before Cl-begins to precipitate in the titration in Figure 7-4. Calculate the concentrationAg+of at the equivalence point in the titration of l-alone. Show that this concentration Ag+of Cl-will precipitate.

Short Answer

Expert verified

The concentration of silver ion at equivalence point in given titration is9.1×10-9M.

Step by step solution

01

Concept used. 

  • In titration, the equivalence point is the point at which the quantity of standard solution and analysis becomes equal and neutralisation occurs.
  • The end point is when the colour changes at a specific point in the titration.
02

The concentration of Ag+  at the equivalence point in the titration of  alone.

The first equivalence point where silver iodide precipitates first because

Vc×0.0845M=0.040L×0.0502MVc=0.040L×0.0502M0.0845M=0.023676L=23.76mLAttheequivalencepoint,theconcentrationsofsilverandiodideionsarethesame.Ag+I-=x2=KspAg+Cl-=x2=8.3×10-17Ag+=9.1×10-9MQ=Ag+Cl-=2.8×10-10TheQvaluewhichisgreaterthansolubilityproductconstantofsilverchloride.Thussilverionscanprecipitate.

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Most popular questions from this chapter

Managing a salt-water aquarium. A tank at the New Jersey State Aquarihas

a volume of 2.9million liters.5Bacteriaare used to remove nitrate

that would otherwise build up to toxic levels. Aquarium water is first pumped into

a 2700-Ldesecration tank containing bacteria that consumeO2in the presence

of added methanol:

2CH3OH+3O2→Bacteria2CO2+4H2O

Anoxic (deoxygenated) water from the desecration tank flows into a gentrification reactor containing colonies of Pseudomonas bacteria in a porous medium. Methanol is injected continuously and nitrate is converted into nitrite and then into nitrogen:

3NO3-+CH3OH→Bacteria3NO2-+CO2+2H2Onitrate2NO3-+CH3OH→BacteriaN2+CO2+H2O+2OH-

a) Desecration can be thought of as a slow, bacteria-mediated titration

ofO2bylocalid="1655109035857" CH3OH. The concentration oflocalid="1655109054860" O2in seawater at localid="1655109040090" 24∘C is localid="1655109045111" 220μm .

How many liters oflocalid="1655109050648" (FM32.04,density=0.791g/mL)are required

by Reaction 1for 2.9 million liters of aquarium water?

b) Write the net reaction showing nitrate plus methanol going to nitrogen.

How many liters of localid="1655109058452" CH3OHare required by the net reaction for 2.9 million

liters of aquarium water with a nitrate concentration of localid="1655109062338" 8100μm?

c) In addition to consuming methanol for Reactions 1 through 3, the

bacteria require 30% more methanol for their own growth. What is the

total volume of methanol required to denitrify 2.9 million liters of

aquarium water?

What is wrong with this procedure? According to Table 7-1, carbonate can be measured by a Volhard titration. Removal of the precipitate is required. To analyse an unknown solution of, Na2CO3, l acidified the solution with freshly boiled and cooled HNO3to give ,0.5 M HNO3. Then I added excess standard, but no Ag2CO3precipitate formed. What happened?

A procedure for determining halogens in organic compounds

uses an argentometric titration. To 50 mL of anhydrous ether is added

a carefully weighed sample (10–100 mg) of unknown, plus 2 mL of

sodium dispersion and 1 mL of methanol. (Sodium dispersion is finely

divided solid sodium suspended in oil. With methanol, it makes

sodium methoxide,CH3O-Na+, which attacks the organic compound,

liberating halides.) Excess sodium is destroyed by slow addition of

2-propanol, after which 100 mL of water are added. (Sodium should

not be treated directly with water, because the H2produced can

explode in the presence of O2:2Na+H2O→2NaOH+H2.)This

procedure gives a two-phase mixture, with an ether layer floating on

top of the aqueous layer that contains the halide salts. The aqueous

layer is adjusted to pH 4 and titrated with , using the electrodes in

Figure 7-5. How much 0.025 70 M AgNO3solution will be required to

reach each equivalence point when 82.67 mg of 1-bromo-4-chlorobutane(BrCH2CH2CH2Cl;FM171.46)are analysed ?

Construct a graph of pAg+versus milliliters of Ag+for the titration of 40.00mLof solution containing 0.05000MBr-and0.05000MCI-. The titrant is0.08454MAgNO. Calculate pAg4at the following volumes:

localid="1654845944495" 2.000,10.00,22.00,23.00,24.00,30.00,40.00mL,second equivalence point,50.00mL.

Ascorbic acid (vitamin C) reacts with according to the equation

Starch is used as an indicator in the reaction. The end point is marked by the appearance of a deep blue starch-iodine complex when the first fraction of a drop of unreacted I3-remains in the solution.

(a) Verify that the structures above have the chemical formulas written beneath them. You must be able to locate every atom in the formula. Use atomic masses from the periodic table on the inside cover of this book to find the formula mass of ascorbic acid.

(b) If 29.41 mL of I3-solution are required to react with 0.197 0 g of pure ascorbic acid, what is the molarity of theI3-solution?

(c) A vitamin C tablet containing ascorbic acid plus inert binder was ground to a powder, and 0.424 2 g was titrated by 31.63 mL of I3-. Find the weight percent of ascorbic acid in the tablet.
See all solutions

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