uv/vis analysis of a cobalt complex at its max gives a reading that is off scale

Question

uv/vis analysis of a cobalt complex at its max gives a reading that is off scale. A direct calibration prepared from cobalt standards at the same wavelength shows that the method is linear between a low standard with an absorption of 0.10, to a high standard with an absorption of 2.0. The best method of handling of the off- scale sample is to a. b. c. d. switch to the method of standard additions. measure the sample at different wavelength with a lower molar absorptivity dilute the sample volumetrically until an absorbance reading within the 0.1-2.0 range is obtained prepare a new series of higher-concentration standards

Explanation / Answer

1) the best way to handle off scale sample is to discard the data and adjust the maximum of the sensitivity of the recorder. Run the spectrum under the new parameters.

So Answer is b

2) The answer is a

the pH of acid will be very low on adding volume of base the pH will increase and suddenly it will increase sharply and will attain a maximum value.

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