Question: 1. During a fed-batch bioreactor run, you are adjusting pH using a 1 Molar solution of Ca(OH)2 (~1500 mOsm). Feed solution with osmolarity of 1400

1. During a fed-batch bioreactor run, you are adjusting pH using a 1 Molar solution of Ca(OH)2 (~1500 mOsm). Feed solution with osmolarity of 1400 mOsm is used for fed-batch operation. The starting cell culture medium has an osmolarity of 300 mOsm. The total base addition was 40 mL/L of culture and the total feed was 350 mL/L. Assume that:

1) In given conditions the base dissolves completely. Hint: remember the molarity of dissolved compound vs undissolved, # of particles is crucial. 2) The total Volume in the Bioreactor is 1 L.

a) estimate the final osmolarity in the bioreactor. b) estimate the final osmolarity if each feed (on top of existing amount) added 50 mls of 1 Molar solution of glucose. (Here use initial setting without the base; any glucose that is already in the feed or base medium is accounted for).

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