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After evaporation to dryness of the aqueous layer then with 0.5 M Na2CO3 neutralizing CF3COOH until the pH near neutral Ͷ¸åµÄÎÄÕ£¬ËµÊDZíÊöÇ·Í× [ Last edited by ÎÒÐÄÓÀºã1567 on 2010-3-1 at 14:39 ] |
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xiaoqihu
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ÎÒÐÄÓÀºã1567(½ð±Ò+1): 2010-03-04 11:21
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After evaporation to dryness of the aqueous layer then with 0.5 M Na2CO3 neutralizing CF3COOH until the pH near neutral ÎÒ¶¼²»ÖªµÀÄãÕâ¸ö¸ÉÔï¹ý³ÌÊÇÔÚpH֮ǰ»¹ÊÇÖ®ºó£¬Äã×îºÃ°ÉÖÐÎÄд³öÀ´°É 1. after evaporation, the aqueous layer, then, was neutralized by Na2CO3. 2. after evaporation, the excess CF3COOH in aqueous layer was neutralized by Na2CO3. 3. before evaporation, the excess CF3COOH in aqueous layer was neutralized by Na2CO3 [ Last edited by xiaoqihu on 2010-3-3 at 09:39 ] |

3Â¥2010-03-02 22:58:27
sunyixinq
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2Â¥2010-03-01 18:13:15














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