The experiment to prove that carbon dioxide concentration influences the rate of photosynthesis: Click here to see the image

The experiment is repeated after adding some sodium hydrogencarbonate (which dissolves in water to produce carbon dioxide) to the water. It is observed that more oxygen bubbles are produced, and thus this shows the increased photosynthesis rate.

My question: The equation for the dissolution of sodium hydrogencarbonate is NaHCO₃ (s) ⟶ NaOH (aq) + CO₂ (aq). But won't the sodium hydroxide turn the solution basic and also influence the rate of photosynthesis?

Thanks in advance,

  • $\begingroup$ @ bpedit. One of my friends (who is a biologist) said that when hydrogencarbonate dissolves, it forms carbonic acid which turns the solution acidic. But how? He says that the hydrogencarbonate combines with the hydrogen ions in solution to form carbonic acid...... $\endgroup$ – Ramana Feb 5 '17 at 5:38

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