Mass of acetic acid in the vinegar

The Twenty mL of water is aIDed to the Erlenmeyer flask is to previously boiled, deionized water. Since water does absorb CO2 from the atmosphere and since CO2 dissolved in water causes it to be slightly acidic, will the use of deionized water that has not been previously boiled cause the mass of acetic acid in the vinegar to be calculated as too high or too low? Explain.

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