Question

For the titration of hcl versus NaOh, suggest a better indicator than methyl orange. Why is methyl orange not the ideal choice for this application?

Answer 1

The pH at the equivalence point of HCl vs NaOH titration is 7.0. MO is not a good indicator for this titration because it changes about 3.5. A better choice is phenolphthalein which changes about 9 or even methyl red which changes about 5.0.Bromothymol blue or phenol red are appropriate also.