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Thread: a problem of Calcium chloride solution

  1. #1 a problem of Calcium chloride solution 
    Forum Freshman
    Join Date
    Jun 2013
    I Preparation of 6%calcium chloride solution,the solution was clear when I prepared, but a week later, see volumetric flask white precipitate at the bottom, very small particles.
    But I think calcium chloride does not deteriorate at room temperature, then
    heating the solution, there are still precipitation.
    Other chemical reactions occur ?

    I love science , I love chemistry
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  3. #2  
    Forum Professor
    Join Date
    Jan 2013
    Any water surface exposed to the air for even a short time will suck CO2 into solution very quickly. Try with water distilled under a vacuum (that is, no air exposure), real quickly checking Ph will reveal 7.0, but since a surface of water was exposed to admit the test paper, within a minute Ph will check lower than 7.0, eventually reaching as low as 5.0. jocular

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