you have 100ml of 0.1M acetic acid and 100ml of 0.1M sodium acetate. mixing appr

Question

you have 100ml of 0.1M acetic acid and 100ml of 0.1M sodium acetate. mixing appropriate volumes of these two solutions will allow you to prepare a buffer. what volume of each of these solutions would you use to prepare 100ml of 0.1M acetic buffer, pH 5.0( pK of acetic acid is 4.76) show calculation please

Explanation / Answer

a>PKa of acetic acid is 4.76, pH=pKa+log[Base]/[Acid]; we need add certain volume of base to make final [Acetate]/[Acetic acid] =2.2. The final [CH3COONa]=0.0688M, [CH3OOH]=0.0313M I used an online calculator to get the results. You should add 220ml sodium acetate to have pH=5.1 b>You have to add 46.5ml (0.1M) HCl to 100ml (0.1M)Tris base to reach pH=8.08, final [base]=0.0365M, final [acid]=0.0317M. Again, I used on line pH calculator to get the results. The on line calculator is at http://www.popproperty.net/PopularTools/PHBuffer1.aspx In case a. You choose initial state as liquid acid, and add liquid chemical base In case b you choose initial state as liquid base, and add liquid acid to convert base to acid.

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