Assertion: crude phosphoric acid | /r/MadeOf | about 30 weight %
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Source sentences:
text: Bearing in mind that concentrated crude phosphoric acids normally contain at least 50 weight % P 2 O 5 , while crude phosphoric acids made by the dihydrate process contain about 30 weight % P 2 O 5 , it is necessary for these aqueous residues to be diluted or concentrated for further use.