Question

How many grams of C6H5COOH are needed to make 2.5 liters of aqueous solution of pH=4.0? Be sure to back correct from equilibrium molecular acid molarity to starting molecular acid molarity.

Answer 1

use the pH to get the hydronium ion concentration: pH = 4.0 or [H+] = 10 PH : PH = -log [H+] ov, [H] : 10-4 ure the ka expression to get the [st scoot] Lot groot) = [ cool] + [Ht] Now. [SH5000]H] [65000H] as com is a weakacid or, di&xtos - (104) x (104) ika 6.3x dos [GHS Coord or [GHCort] = (104) x (104) (6.3x Los) or [&Hgcool] = 1.587 X10 4 M OV, X 1.587 *10-4 mol/ Grams needed for 2.5 liters M xvolume = om/molar mass or (4.587x10 mol/L) x (2.5L) = x/ (122 gulmel) 587 xso 4 mol/L 2.5 LX122 gw por molarmass of H505H2 OV, X20.0484 gm {(12x7) + (1x6) + ( 16 X2}}} in & Hs cooh needed = 0.04848m - 849m 6m+ 32gm. 2124 gm/mol atomic weight of C2 129 H = Igu от 16-