need urgently

Groundwater containing 60 mg/L of CO2 at 10oC is pumped through a spray nozzle aerator, and the CO2 concentration is reduced to 5.6 mg/L. If the alkalinity of the water is 200 mg/L as CaCO3, and the initial pH is 6.93,  what is the  pH of the water after CO2 removal? Assume the water temperature remains at 10oC and that ionic strength corrections can be neglected.