Question

need help with this lab work for a chemistry experiment!!!

volume of 0.10 M NaOH added to 50mL of the acid mixture:

initial burette reading:0.1 mL

Final burette reading: 32.3 mL

volume of NaOH added: 32.2mL

pH of optimal buffer: 4:66 pH

Ka of unknown weak acid: _______

assigned pH of new buffer to make: 4.46 pH

new buffer data:

H+ needed: _____

Ka: H+ same as (Ka/H+) : ______

A-:[HWA] same as (Ka/H+) : _____

volume of A-

volume of HWA:_____

pH of new buffer: 4.38 pH

Answer 1

The solution of the given question is shown below

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Conc of weak aide. (hrace) Mv, M.2 (weat acid) 0.1.X 342 M, x(50+322) M₂ = 0.039 M. Cone of weak acid (AWA). 0. 039 M. The neak acid is titrated with 0.1m Naon, Equivalence paint - 32 del phat half equivalence point = pka. Hay equivalence point. Half - Equivalence point. Vole of Naon at equivalence - 32:8. 16.1 me. d pH = pH given at 4.66. pka = 4.66. Ka (Weakacid) - 10-Phe - 10 -4.66 Ka-2.188 105 Assigned pH of the buffer: pH = -log[ht] 4.38 (HT] - - 1%-4.30 [at] - 4. 16x10-5 Ko= 4.16x10s (similar to 10PH- 10pka). As Pon 9.54 or AA): 9.54 [A] = 109.54 TA) 2.88 x 100