M25-CHEM-HL-TZ3-P1A-Q26

Which apparatus can be used to monitor the progress of this reaction?
\( NaHCO_3(aq) + HCl(aq) \rightarrow NaCl(aq) + H_2O(l) + CO_2(g) \)
I. A pH meter
II. A gas syringe
III. A colorimeter