NEED HELP! Please anwswer the following true/false questions relating to spectro

Question

NEED HELP!

Please anwswer the following true/false questions relating to spectrophotomentry in experiment B: An indicator that has a wavelength for the absorbance maximum of 410 nm will have a yellow color. The wavelength for the absorbance maximum of the pH indicator you examined is the same when the indicator is in pH 4 or pH 10 buffer. If an indicator is yellow it absorbs yellow light. Transmittance is linearly porportional to the concentration of analyte or sample in solution. Absorbance is linearly related to sample concentration (generally if molarity is less than 0.001M).

Explanation / Answer

1) An indicator that has a wavelength for the absorbance maximum of 410 nm will have a yellow color - TRUE [because absorption is in violet region (400 nm to 450 nm) it reflects the complementary color yellow which gives the color to the indicator]

2) The wavelength for the absorbance maximum of the pH indicator you examined is same when the indicator is in pH 4 or ph 10 buffer - FALSE (absorbance maximum will be different)

3) If an indicator is yellow it absorbs yelllow light - FALSE (it absorbs the complementary color it is violet)

4) Transmitance is linearly porportional to the concentration of analyte or sample in solution- FALSE (they have inverse relation)

5) Absorbance is linearly related to sample concentration - TRUE

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