Assertion: borax's chemical formula | /r/HasProperty | obtained in high purity
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text: [B 4 O 5 (OH) 4 ]·8H 2 O. The borax chemical formula is also commonly written in a more compact notation as Na 2 B 4 O 7 ·10H 2 O. Sodium borate can be obtained in high purity and so can be used to make a standard solution in titrimetric analysis.