The water for the pan is not saturated with co2. will the reported percent caco3 in the original sample be too high, too low, or unaffected?

Co2 will dissolve in water if water is saturated with Co2 first then it will absorb some of CO2 it appear as less is absorb that was actually the case. this would make it appear as present of CACO3 is in original sample is lower than it will be too low