JAMB - Chemistry (2019 - No. 34)
Na\(_2\)CO\(_3\) + 2HCl \(\to\) 2NaCl + H\(_2\)O + CO\(_2\)
The indicator most suitable for this reaction should have a pH equal to
5
7
3
9
Explication
Methyl orange is the best indicator for the reaction with range 3.1 - 4.4.