What's the plural form of phenolsulphonphthalein? Here's the word you're looking for.
Answer
The noun phenolsulphonphthalein can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be phenolsulphonphthalein.
However, in more specific contexts, the plural form can also be phenolsulphonphthaleins e.g. in reference to various types of phenolsulphonphthaleins
or a collection of phenolsulphonphthaleins.
