Caustic soda yog ib qho ntawm cov tshuaj siv ntau tshaj plaws. Nws yog siv los neutralize acids; lws suav muab tshuaj txhuam; kom precipitate hlau astheir hydroxides; nyob rau hauv petroleum refining; nyob rau hauv thesaponification ntawm esters; nyob rau hauv kev kho mob ntawm cellulose, yas, thiab roj hmab; thiab nyob rau hauv ntau ntau yam thiab analytical daim ntaub ntawv.

Sodium hydroxide yog muag ua lag luam raws li cov dej tsis muaj dej los yog cov pellets lossis li 50% lossis 73% aqueous daws. Nws muaj suav tsis txheeb siv kev lag luam thiab yog ib qho ntawm 10 cov tshuaj zoo tshaj plaws ntawm kev tsim khoom thiab siv thoob ntiaj teb. Kwv yees li 15 lab tons ntawm sodium hydroxide yog siv txhua xyoo. Nws qhov kev siv loj tshaj plaws, siv li ib nrab ntawm nws cov khoom tsim tawm, yog lub hauv paus hauv kev tsim lwm cov tshuaj. Nws yog siv los tswj pH thiab neutralize acids hauv cov txheej txheem tshuaj. Kev lag luam ntawv ua rau kev siv ntau ntawm sodium hydroxide hauv cov txheej txheem pulping. Sodium hydroxide yog siv los cais cov fibers los ntawm dissolving lub txuas lignin. Nws yog siv nyob rau hauv ib tug zoo xws li zam nyob rau hauv zus tau tej cov rayon los ntawm cellulose. Sodium hydroxide yog ib qho tshuaj tseem ceeb hauv kev lag luam xab npum.Nyob rau hauv cov txheej txheem saponification, triglycerides tau los ntawm cov tsiaj thiab nroj tsuag yog rhuab nyob rau hauv abasic tov muab glycerol thiab xab npum:

Sodium hydroxide yog siv nyob rau hauv kev lag luam textile rau bleaching thiab kho textiles kom lawv dyeing yooj yim dua. Kev lag luam roj av siv sodium hydroxide hauv cov av nkos thiab asa bactericide. Sodium hypochlorite (NaOCl) yog siv dav siv los ntxuav thiab ua tshuaj tua kab mob.Cov tshuaj dawb hauv tsev feem ntau muaj li 5% sodium hypochlorite tov. Sodiumhypochlorite yog npaj los ntawm reacting chlorine nrog sodium hydroxide: Cl2(g) + 2NaOH(aq) → NaOCl(aq) + NaCl(aq) + H2O(l). Sodium hydroxide yog siv nyob rau hauv kev lag luam khoom noj khoom haus rau ntxuav thiab tev txiv hmab txiv ntoo thiab zaub. Sodium hydroxide yog cov khoom me me hauv ntau cov khoom siv hauv tsev, tab sis nyob rau hauv ob peb nws yuav ua tau ntau tshaj li ib nrab ntawm cov khoom. Dranocrystals muaj nyob nruab nrab ntawm 30% thiab 60% sodium hydroxide thiab qee cov dej huv tuaj yeem muaj 100% sodium hydroxide.