【Daily Question】Chemical Engineering Principles 564: Cation Exchange Resin Failure (May 25)

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This post was last edited by Zaihui Kangqiao on 2017-5-25 07:59. The Chemical Engineering Theory section is now launching a \"One Question per Day\" initiative to help everyone reinforce their basic knowledge in chemical engineering. Subsequent series will include those on \"Principles of Chemical Engineering\", \"Mass Transfer and Separation\", \"Thermodynamics in Chemical Engineering\", and \"Chemical Process Engineering\". We hope for your active support~~~ Replies to the \"One Question per Day\" initiative can be viewed directly at **; the thread will be closed after 1 day! ! To encourage everyone’s continued participation this year! Participation earns 3 wealth points, with an additional 4 wealth points for correct answers~~~ Short answer question: What are the cations that penetrate the resin layer first after the anion exchange resin becomes ineffective? sodium ions