* Polarity: Phosphoric acid is a highly polar molecule due to the presence of three hydroxyl groups (-OH) which form strong hydrogen bonds. Ethers, on the other hand, are relatively non-polar.
* "Like Dissolves Like": The principle of "like dissolves like" states that substances with similar polarities tend to dissolve in each other. Since phosphoric acid is polar and ethers are non-polar, they are not compatible for dissolving.
Important Note: While phosphoric acid is not soluble in typical ethers like diethyl ether or tetrahydrofuran (THF), it might be slightly soluble in very polar ethers like ethylene glycol dimethyl ether (glyme).
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