Questions from General Chemistry

Q: A portable photometer with a linear response to radiation registered 75.

A portable photometer with a linear response to radiation registered 75.5 µA with a blank solution in the light path. Replacement of the blank with an absorbing solution yielded a response of 23.7 µA....

Q: Sketch a photometric titration curve for the titration of Sn2+ with

Sketch a photometric titration curve for the titration of Sn2+ with MnO-4. What color radiation should be used for this titration? Explain.

Q: Iron(III) reacts with thiocyanate ion (SCN) to

Iron(III) reacts with thiocyanate ion (SCN) to form the red complex, Fe(SCN)2+. Sketch a photometric titration curve for Fe(III) with thiocyanate ion when a photometer with a green filter is used to c...

Q: Ethylenediaminetetraacetic acid displaces bismuth(III) from its thiourea complex:

Ethylenediaminetetraacetic acid displaces bismuth(III) from its thiourea complex: Bi(tu)63+ + H2Y2- → BiY- + 6tu + 2H+ where tu is the thiourea molecule, (NH2)2CS. Predict the shape of a photometric...

Q: The accompanying data (1.00-cm cells) were

The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration of 10.00 mL of Pd(II) with 2.44 × 10-4 M Nitroso R (O. W. Rollins and M. M. Oldham, Anal. Chem., 1...

Q: What is the “operational definition of pH”? Why is it

What is the “operational definition of pH”? Why is it used?

Q: A 5.24-g petroleum specimen was decomposed by wet

A 5.24-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follo...

Q: Iron(III) forms a complex with thiocyanate ion that has

Iron(III) forms a complex with thiocyanate ion that has the formula Fe(SCN) 2+. The complex has an absorption maximum at 580 nm. A specimen of well water was assayed according to the following scheme....

Q: A. J. Mukhedkar and N. V. Deshpande (

A. J. Mukhedkar and N. V. Deshpande (Anal. Chem., 1963, 35, 47, DOI: 10.1021/ac60194a014) report on a simultaneous determination for cobalt and nickel based on absorption by their 8-quinolinol complex...

Q: Molar absorptivity data for the cobalt and nickel complexes with 2,

Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36,400 and εNi = 5520 at 510 nm and εCo = 1240 and εNi = 17,500 at 656 nm. A 0.425-g sample was dissol...