একটি নির্দিষ্ট তাপমাত্রায় প্রতি লিটার জলীয় দ্রবণে উপস্থিত কোনো ক্ষারকের মোল সংখ্যার যে ভগ্নাংশ বিয়োজিত অবস্থায় থাকে, তাকে ঐ ক্ষারকের বিয়োজন ধ্রুবক বলে।
B−+H2O⇌HB+OH−
ক্ষারক
Kb=[B−][H2O][HB][OH−]=[B−][HB][OH−]
এখানে, kb হলো ক্ষারুকের বিয়োজন ধ্রুবক। এর মান বৃদ্ধি পেলে ক্ষারকের শক্তিমাত্রা বৃদ্ধি পায়। এর একক হলো molL−1
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