The final volume of buffer solution must be 100.00 mL and the final concentration of the...

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Chemistry

The final volume of buffer solution must be 100.00 mL and thefinal concentration of the weak acid must be 0.100 M.
Based on this information, what mass of solid conjugate baseshould the student weigh out to make the buffer solution with apH=7.0 (in grams)? Based on this information, what volume of acidshould the student measure to make the 0.100 M buffer solution (inmL)?
My weak acid is Sodium dihydrogen phosphate monohydrate, Ka=6.23X10^-8, 2.00M and my conjugate base is Disodium hydrogenphosphate heptahydrate, Na2HPO₄*7H₂O

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4.3 Ratings (816 Votes)

Sol Given final concentration of weak acid ie NaH2PO4H2O 0100 M Also final volume 10000 mL 0100 L Ka of NaH2PO4H2O 623 x 108 therefore pKa log Ka log 623 x 108 720 720 so pKa of NaH2PO4H2O 720 given that pH of acidic buffer solution 70 Now by using HendersonHasselbalch equation we have pH pKa log conjugate base See Answer

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