Assertion: shampoo's acid | /r/HasProperty | added
Facets:
Source sentences:
text: Acids or bases such as citric acid or sodium hydroxide are added to adjust the pH of a shampoo so the detergents will provide optimal cleaning.
text: Every shampoo must achieve the right pH balance; sodium hydroxide and hydrochloric acid can be added until the shampoo is at the target pH.