Kev Tsim Khoom Sodium Hydrosulfide Los Ntawm Kev Nqus NaOH
Txoj Kev Nqus NaOH Ib Txwm Muaj
Thaum NaHS sodium hydrosulfide concentration ncav cuag 70%, nws tsim cov dihydrate flakes.
Thaum cov concentration qis dua, nws muaj nyob ua kua trihydrate.
Txheej Txheem:
Ib lub raj mis 1 L peb lub caj dab puag ncig hauv qab muaj lub tshuab nplawm thiab lub tshuab condenser reflux (txuas nrog lub raj mis CaCl₂ ziab).
Lub raj mis raug ntxuav nrog cov nitrogen qhuav, tom qab ntawd them nrog 200 mL (3.4 mol) anhydrous ethanol.
12 g (0.522 mol) ntawm cov hlau sodium huv si raug ntxiv rau hauv cov khoom me me hauv qab kev sib xyaw thiab rov qab mus rau qhov qub kom txog thaum yaj tag.
Ib lub raj xa roj raug ntxig rau hauv cov kua, thiab H₂S qhuav (qhuav dhau P₂O₅) raug npuas ntawm 5–10 npuas/sec rau 2 teev hauv qab kev sib tov.
Tom qab txias, 750 mL anhydrous ether ntxiv rau kom ua rau NaHS sodium hydrosulfide sai sai tag nrho.
Ua Haujlwm:
Cov khoom sib tov no raug lim sai sai (cov khoom sib xyaw ua ke) kom tiv thaiv kev nqus dej noo.
Cov khoom khov raug ntxuav 3 × nrog anhydrous ether, tom qab ntawd ziab hauv lub tshuab nqus tsev desiccator (CaCl₂) rau ob peb teev.
Tau: 29.4 g ntawm ≥98% NaHS ntshiab.