The oxalic acid was cauterize in the muffle at 200 ℃ until fully volatilized. The solution pH was adjusted with drop ( 1+ 1) hydrochloric acid ( the congo red test paper change color from red to blue) to about 4 to remove carbon dioxide.

  • 在马弗炉(200℃)灼烧至草酸全部挥发,滴加(1+1)盐酸,使刚果红试纸由红变蓝色(或调节pH到4左右),除去二氧化碳。

  • 互联网摘选 2025-01-20 11:37:58

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