Squaric acid
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Squaric acid, also called quadratic acid because its four carbon atoms approximately form a square, is a diprotic organic acid with the chemical formula C₄O₂(OH)₂. Wikipedia
Formula: C4H2O4
Molar mass: 114.06 g/mol
Acidity (pKa): pKa1 = 1.5; pKa2 = 3.4
Melting point: 300 °C (572 °F; 573 K)
PubChem CID: 17913