Then perform an acidity titration using a phenolphthalein endpoint or a pH.

Acid-base titration 

Before you answer, you must know the nature of the components of the cleaning material, so you can choose the appropriate way.

If we make sure that the only rule is soda we use direct calibration in the presence of an appropriate detector or indirect calibration. We apply this calibration when direct calibration is impossible. Or use calibration using a PH device .