Q1: The complex that is formed between gallium (III) and 8-hydroxyquinoline has

Question

Q1: The complex that is formed between gallium (III) and 8-hydroxyquinoline has an absorption maximum of 363nm. A 0.0059M solution of the complex has a transmittance of 47.3% when measured in a 1.00-cm cell at this wavelength. Calculate the molar absorptivity of the complex.

Q2: A compound has a strong absorption at 3.43x1015 Hz. What is the ?max( in Å (angstroms)) for this compound?  

Q3: A student notice that the molar absorptivity was 1,904 mL/(mg*m). What is the molar absorptivity in units of L/(mol*cm)? The molar mass of the compound is 210g/mol.

Explanation / Answer

Absorbance, A = 2 - log(%T)

= 2 - log(47.3)

= 2- 1.6748

= 0.3252

Now, according to Lambert-Beer law, we know, A = e.C.L,

where e = molar absorptivity; C= concentration (0.0059M); L = length (1.00 cm)

Hence, molar absorptivity, e = 55.118 L mol-1 cm-1

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.