Kev tshuaj xyuas txoj kev ntawm stearic acid

Dej-soluble acid: Noj 5 g ntawm cov khoom no, yaj nws los ntawm cua sov, ntxiv tshiab boiling dej ntawm sib npaug zos ntim, co rau 2 feeb, cia txias, lim, ntxiv 1 tee ntawm methyl txiv kab ntxwv qhia kua rau lub filtrate, nws yuav tsum tsis txhob. qhia liab.

Tsis muaj roj los yog siv quav ciab: Siv 1.0g ntawm cov khoom no, ntxiv 0.5g ntawm anhydrous sodium carbonate thiab 30mL dej, boil kom yaj, thiab cov tshuaj yuav tsum tau meej.

Residue on ignition: Noj 4.0g ntawm cov khoom no thiab tshuaj xyuas raws li txoj cai. Qhov seem seem yuav tsum tsis pub tshaj 0.1%.

Hnyav hlau: Siv cov khoom seem seem nyob rau hauv cov khoom seem ntawm qhov hluav taws kub thiab tshuaj xyuas raws li txoj cai, thiab cov ntsiab lus ntawm cov hlau hnyav yuav tsum tsis pub tshaj 5 feem ntawm ib lab.