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Sodium tetrahydroxyborate
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<p>Sodium tetrahydroxyborate is a <a href="/facts/Salt_(chemistry)/lsSKwGpn">salt</a> (ionic compound) with <a href="/facts/Elemental_formula/mc8K2H8Y">chemical formula</a> <a href="/facts/Sodium/eYuSPu2V">Na</a><a href="/facts/Hydrogen/BoYHjl0J">H</a>4<a href="/facts/Boron/Pmwgd7Mf">B</a><a href="/facts/Oxygen/acyn6o8r">O</a>4 or Na+[B(OH)4]−. It is one of several <a href="/facts/Sodium_borate/SwoMlM4t">sodium borates</a>. At <a href="/facts/Room_temperature/YHwUIUTE">room temperature</a> it is a colorless crystalline solid. </p><p>The element ratio corresponds to the oxide mixture Na2O·B2O3·4H2O, but the structure of the solid is quite different from that suggested by this formula. </p>