Question

A beaker with 1.90x102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total 0.460 MHCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740 Express your answer numerically to two decimal places. Use a minus (-sign if the pH has decreased.

Answer 1

Salutoh d buffer th pH "Jint cafc ulate the Cohce"切c.kons of ac.trc oerd ond acetate an'ans preren the buffor. in buffe ho Th:s uenHes Hauselbol ch equation 5.000 4.74 + log CH2 Co oH づtorn this, we can sey that th: s beffen contains mone Cony goted base thon wenk aud. Thsi the care becouse the ph of the bhffer i grest thon the pka of the oed we con 거ewrt: te the equation as , 26

Then the becomes t 1-8191y 119 Then s 2.819 Therefore subsドFute g in eGA 二0.03546 Ar predietes the uffor Cantoins hee Conjujte bare thon seok oud + 0.00 3496 metes H3 oto the buffer b uay of the HCI Sektch

re2..ce ac e hc ac:3 a ne, sote 3 CS(a) se tthe ndenity of the acctote aniens as the in the bu ffen Contain

hH36" C mides → Completely Consum nCH3cec H Ο.oo673 moles +0.003496 The heus con cantho, tas, r 아 the weak aed ans of the nj bare etl be 201。226 maler @sce.可t 191.XIo3L 191.6 刈o-3L

Using Hendetan - Hausel belch tp ein to tsledale the he pe the solution leg (. 으es.cran pH: tt T+。t :14 613 There re the pHe} ther-L.hom chany@ by pH is dec ease?