He pāpāhua. He whakapūnguru te konutai waihā, ā, ka whakamahia hei whakangū i te waikawa. Ka whakamahia hoki hei hanga hopi. Mā te tauhohe pāhiko ka hua ake te konutai waihā (NaOH) i te konutai pūhaumāota (NaCl).
An alkali. Sodium hydroxide is corrosive and is used to neutralise acid. It is also used in the manufacture of soap. It is produced from sodium chloride by the process of electrolysis.