ʻO ka soda caustic kekahi o nā kemika i hoʻohana nui ʻia. Hoʻohana ʻia ia e neutralize i nā waikawa; e hana i nā paʻakai sodium; e hoʻokahe i nā metala e like me kā lākou hydroxides; i ka hoʻomaʻemaʻe ʻaila; i ka saponification o nā esters; i ka mālama ʻana i ka cellulose, plastics, a me ka rubber; a i loko o nā noiʻi hoʻohālikelike a me ka analytical.

Kūʻai ʻia ka sodium hydroxide ma ke ʻano pāʻoihana e like me nā flakes anhydrous a i ʻole nā ​​​​palapala a i ʻole he 50% a i ʻole 73% wai. He nui kona hoʻohana ʻana i ka ʻoihana a ʻo ia kekahi o nā kemika 10 kiʻekiʻe e pili ana i ka hana a me ka hoʻohana ʻana ma ka pae honua. Ma kahi o 15 miliona tons o ka sodium hydroxide e hoʻohana ʻia i kēlā me kēia makahiki. ʻO kāna hoʻohana nui loa, e hoʻopau ana ma kahi o ka hapalua o kāna hana ʻana, he kumu ia i ka hana ʻana i nā kemika ʻē aʻe. Hoʻohana ʻia ia e kāohi i ka pH a hoʻokaʻawale i nā waikawa i nā kaʻina kemika. Hoʻohana nui ka ʻoihana pepa i ka sodium hydoxide i ka hana pulping. Hoʻohana ʻia ʻo Sodium hydroxide e hoʻokaʻawale i nā fiber ma o ka hoʻoheheʻe ʻana i ka lignin hoʻohui. Hoʻohana ʻia ia ma ke ʻano like i ka hana ʻana i ka rayon mai cellulose. ʻO ka sodium hydroxide kahi mea nui i ka ʻoihana kopa. Ma ke kaʻina hana saponification, hoʻomehana ʻia nā triglycerides i loaʻa mai nā holoholona a me nā mea kanu i ka hopena abasic e hāʻawi i ka glycerol a me ke kopa:

Hoʻohana ʻia ka sodium hydroxide i ka ʻoihana lole no ka hoʻomaʻemaʻe ʻana a me ka mālama ʻana i nā textiles i mea e hiki ai ke waihoʻoluʻu maʻalahi. Hoʻohana ka ʻoihana ʻaila i ka sodium hydroxide i ka ʻeli ʻana i ka lepo a me kahi bactericide. Hoʻohana nui ʻia ka sodium hypochlorite (NaOCl) no ka hoʻomaʻemaʻe ʻana a ma ke ʻano he disinfectant. ʻO ka bleach home maʻamau he 5% ka hopena sodium hypochlorite. Hoʻomākaukau ʻia ka Sodiumhypochlorite ma ka hana ʻana i ka chlorine me ka sodium hydroxide: Cl2(g) + 2NaOH(aq) →NaOCl(aq) + NaCl(aq) + H2O(l). Hoʻohana ʻia ka sodium hydroxide i ka ʻoihana meaʻai no ka hoʻomaʻemaʻe a me ka ʻili ʻana i nā huaʻai a me nā mea kanu. ʻO ka sodium hydroxide kahi mea liʻiliʻi i loko o nā huahana maʻamau, akā i loko o kahi liʻiliʻi hiki ke lilo ma mua o ka hapalua o ka huahana. Aia nā Dranocrystals ma waena o 30% a me 60% sodium hydroxide a hiki i kekahi mau mea hoʻomaʻemaʻe wai ke komo i ka 100% sodium hydroxide.