Need help answering this question A photometer with a linear response to radiati

Question

Need help answering this question

A photometer with a linear response to radiation gave a reading of 575 mV with a blank in the light path and 149 mV when the blank was replaced by an absorbing solution. Calculate a. the transmittance and absorbance of the absorbing solution. Transmittance = Absorbance = b. the expected transmittance if the concentration of absorber is one half that of the original solution. Transmittance = c. the transmittance to be expected if the light path through the original solution is doubled. Transmittance =

Explanation / Answer

a) transmittance = P/Po = 149/575 = 0.259

absorbance = log10 (Po/P) = 0.586

b) absorbance is halved here

=> New absorbance is 0.293

=> log (1/T) = 0.293

=> 1/T = 1.963

=> New transmittance = 0.509

c) absorbance is doubled here

=> New absorbance is 1.172

=> log (1/T) = 1.172

=> 1/T = 14.859

=> New transmittance = 0.067

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

---

---

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