Question

(ONLY ANSWER IF U R SURE PLZ) A scientist is performing a fermentation of bioethanol and the current pH is roughly 6.5. What should the scientist do to get the pH to the optimum value of 5.0?
A. Increase the temperature, which will lower the pH.

B. Add an appropriate amount of acetic acid.

C. Adjust the airflow to allow more oxidation.

D. Add an appropriate amount of sodium hydroxide.

Answer 1

D) add an appropriate amount of sodium hydroxide

Answer 2

D. Add an appropriate amount of sodium hydroxide.

Usually, chemical processes require an optimum pH. This is the pH at which the desired chemical conversion gives  the maximum yield.

As we can see, the pH of the system is much higher than the optimum pH. We can decrease the pH to the optimum pH of 5.0 by adding an appropriate amount of  a base such as NaOH.

Hence, the pH can be brought to 5.0 from 6.5 by adding an appropriate amount of NaOH.

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