What are the limitations of litmus paper and phenolphthalein indicators? Name two other indicators that can be used that do not have such limitations.

False reading may be obtained if there is a run over from adjacent reagent area in excessively wetted strips

Phenolphthalein only works efficiently from 4 to 10 ph

Litmus and phenolphthalein and methyl orange indicators can only allow you to tell if solution is alkaline, neutral or acidic

The two indicators with less limitations are methyl orange and thymol blue