次氯酸钠，化学式NaClO，是钠的次氯酸盐。次氯酸钠与二氧化碳反应产生的次氯酸是漂白剂的有效成分。

氯气溶于冷而且稀的氢氧化钠溶液产生次氯酸钠、氯化钠及水：

Cl₂ + 2NaOH → NaClO + NaCl + H₂O

注意氯气溶于热而且浓的氢氧化钠溶液不会产生次氯酸钠，而会生成氯化钠、氯酸钠及水：

3Cl₂ + 6NaOH → 5NaCl + NaClO₃ +3H₂O

The North American Computational Linguistics Olympiad (NACLO) is a computational linguistics competition for high school students in the United States and Canada that has been held since 2007. Around 1000 students participate annually. Since 2008 the contest has consisted of two rounds, the second being administered to the top scorers in the first round. The top-scoring students on the second round qualify for the International Linguistics Olympiad (IOL), one of the international science olympiads.