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NY_sky: ½ð±Ò+5, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2013-05-24 00:51:03
NY_sky: ½ð±Ò+5, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2013-05-24 00:51:03
| Fetch 5g of A into 400ml conical flask, add 40mL of 4mol/L sodium hydroxide solution, after alkalized in 30¡æ thermostat water bath for 1 hour, dropping 20mL of B slowly, reacted for 3 hours, then standing for 1 hour. Centrifuging and washing to makes it showed neutral, fianally filtering and washing with 200mL of C, after freezing and drying the filter residue, D was obtained. |
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