1. To measure $k_La$, a fermenter was filled with 10 L of 0.5 M sodium sulfite solution containing 0.003 Cu** ion and the air sparger was turned on. After 10 minutes, the airflow was stopped and a 10 mL sample was taken and titrated. The concentration of the sodium sulfite in the sample was found to be 0.21 mol/L. The experiment was carried out at 25°C and 1 atm. Calculate the oxygen uptake and $k_La$. $C_L$ = 8.43 x 10<sup>4</sup> g/L at 25°C and 1 atm