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6. Talk about the various combinations of cations, and anions that lead to acidic, basic or neutral salt solutions. Give an example for each combination and give an explanation for each example. 7. Sodium stearate (C1, HCOONa) is a major component of bar soap. The Ka of stearic acid is 1.3x10-5. What is the pH of 10.0 mL of a solution containing 0.42 g of sodium stearate?

Answer 1

na 6) Nao ao - (hodiumchlondes Neutral sullo (It is made up of strong Acid Hle and strong Base Naoh' which fully neutralise each other) Å Hy e Acidic (Ammanirem Chlorides sult( It is made up of strong acid - He and weak Base 'NH OH Thus, Here the Nature of strong acid makes the salt Nhu ce to be acidie in nature) cherina - (Sodium acetute) Basic salt / It is made up of weak acid 'CH₂ LNH' Cacetic acid) and strong Base (NaOH' Mess, Here the Nature of Strung base makes the salt choo na to be basic in nature) ne =7) mass of sodium Stearate (l,gt Coo Na) = 0.42g Molar mass of sodium Stearate = 178/2 +35X1 + 12+2X16+23 2 300g/mote Molanity of Cath Coona = 0.42 x 1000 306 XLa = 0.1379 Сcrv Hry-2 : Ссан, съ°) го,1377 tearate in conjugate Bure of weak and and thus undergoes animie. hydrolysis . Stearic YAHO رونه

= Cizhar Cooo + H₂oce " Cag 0.137M (12H2 cool at on iss Cage . Cage' "eq - Kno too I Ab 0.137-1 Categorie 20-137m Stearic acid - z 10-14 [CAM Cool] [or] Captis 600] [HO] 1.3x10t Ts Yunity as 16 Worjouktion Constanta of water. atute concentrution of hure liquid as Considered to be unity) a72 on t o los the 0-137 n a 137 x 10 = 0-1054 x 10-9 1.3 Cw) • • • J .o-Y XI - -|- 03 i pole -log colle). -671.03x60-4), 4.19. (pho 14 -4.99 = 9.01]