Dear all. I have a research that's about Boehm titration to determine the acidity of activated carbon surface. In this research, I use any solutions, such as NaOH, Na2CO3, NaHCO3, and HCl. NaOH can be standardized by oxalic acid standard. Na2CO3 is primary solution and it can be a standard solution for HCl. HCl can be a standard solution for NaHCO3. But, I don't know the pH indicator for both HCl and NaHCO3 standardization. Could you help me to solve my problem?

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