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[求助]
求助怎么在化學沉淀反應中控制溶液PH恒定在9,謝謝 已有6人參與
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具體反應是乙酸鈣溶液中滴加磷酸(85%wt),怎么控制整個反應過程溶液PH恒定在9?文獻中是加氫氧化鈉溶液。 文獻原文 The starting materials used in this investigation are analytical-grade (CH3COO)2Ca·xH2O (99%, Aldrich Chemical company, Inc., USA) which is used as the Ca source, and H3PO4 (85%, Riedel-deHaen, Seelze, Germany) as the P source. After dissolving 0.015 mole (CH3COO)2Ca·xH2O in different deionized water/anhydrous methanol (Merck) volume ratio, Poly (acrylic acid) (Mw 2000) (PAA, Aldrich Chemical company, Inc., USA) was added to the solution and adjusted the solution to the pH value of 9 using 5 M NaOH solution. Phosphoric acid (0.01 mole) was then dropped into the above solution and at the same time, the sodium hydroxide solution was used to keep the solution at pre-determined pH value throughout the entire synthesis process. 因為滴加的濃磷酸是強酸,反應過程中ph降得很快,我直接往反應體系中加NaOH固體,但還是不好控制,有ph計,但是讀取也有一個過程。想了很久沒有想到很好的方法,希望得到各位達人相助,很感激! |
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