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Which of the following are valid reasons you must repeat the standard curve (calibration plot) for crystal violet this week? I The spectrophotometer may not be the same instrument as last week. II The cuvette will not be the same as last week. III, A spectrophotometer may give different results on different days. a. I and III only b. I and II only c. II and III only d. I, II, and III

Answer :

Option c) is  correct . The cuvette will not be same as last week or spectrophotometer may give different results on different days.

What is calibration plot?

This curve is used in analytical chemistry for the determination the concentration of an unknown sample solution.

Some errors might get during measurements

1. didn't wait for instrument to calibrate. (Before showing 0.00 have placed cuvette in it)

2. Not handled the cuvette in correct way.

3. May changed the cuvette. (Size of cuvette)

For more information about calibration curve please visit:

https://brainly.com/question/14662384

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