Question

More Information on submitting your Lab Report LAB DATA Concentration (M) of starting solution Transmittance, T. (Blank) T (15 . 0.034 MOP. 7 .com NH, diluted with distilled H 0 to 100 ml. volume) T(15 ml. Unknown CT solution + 7 ml. come NH, diluted with distilled H 0 to 100 ml. total volume) LAB CALCULATIONS Absorbance (15-ml. Dilution) Ratio M/A (use 0.004 M as the given M) for the 15-ml. Dilution Absorbance of Unknown (Is Dilution) Molarity (M) of Unknown (15 ml. Dilution)

help please

Answer 1

Absorbance = 2 - log(%T)

Answer a)

Absorbance of dilution = 2 - log(62.8) = 0.167

Absorbance of Blank = 2 - log(98.9) = 0.005

Corrected absorbance of dilution = 0.167 - 0.005 = 0.162

Answer b)

M/A = 0.024 M/0.162 = 0.148

Answer c)

Absorbance of unknown = 2 - log(38.1)

= 0.419

Corrected absorbance = 0.419 - 0.005 = 0.414

Answer d)

Molarity of unknown = (M/A)*Absorbance in c)

= 0.148 * 0.414

= 0.061 M