phosphotungstic acid
noun
phos·pho·tung·stic acid
-ˌtəŋ-stik- 
: any of several acids obtainable from solutions of phosphoric acid and tungstic acid and used chiefly as precipitants (as for alkaloids and for basic dyes for pigments) and in analytical reagents
especially
: a greenish yellow crystalline acid H3PW12O40·xH2O used as a reagent and as a biological stain
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“Phosphotungstic acid.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/phosphotungstic%20acid. Accessed 25 Nov. 2024.
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