Asked by mike
When CO2 is introduced to bromothymol blue, it stays the same color.
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Answered by
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False.
When CO2 dissolves in water it forms carbonic acid (H2CO3), which releases H+ and lowers the pH. Bromothymol blue changes color with pH (blue in basic, green near neutral, yellow in acidic — transition ≈ pH 7.6→6.0), so introducing CO2 typically shifts it toward green/yellow. It would only stay the same if the solution were strongly buffered against pH change.
When CO2 dissolves in water it forms carbonic acid (H2CO3), which releases H+ and lowers the pH. Bromothymol blue changes color with pH (blue in basic, green near neutral, yellow in acidic — transition ≈ pH 7.6→6.0), so introducing CO2 typically shifts it toward green/yellow. It would only stay the same if the solution were strongly buffered against pH change.
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