The pH of ammonium phosphate solution. if  pKa of phosphoric acid and pKb of ammonium hydroxide are 5.23 and 4. 75 respectively, is--------

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    Solution:

    Since NH43PO4 is salt of weak acid  H3PO4 and weak base NH4OH.

    pH=7+12pkapkb=7+12(5.234.75)=7.24 

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