Question

18) The primary buffer system that controls the pH of the blood is the buffer system. a) carbon dioxide, carbonate b) carbonic acid, bicarbonate e) carbonate, bicarbonate @ carbonic acid, carbon dioxide e) carbonate, carbonic acid 19) A solution containing which of the following substances will be a buffer solution? a)-RbCl, HCH (6) CsF, HF c)- Nal, HI d) KBr, Br e) KNO, HNO, 20) Calculate the pH of a solution prepared by dissolving 1.50 mol of benzoic acid (HA) and 3.00 mol of sodium benzoate (A-) in water sufficient to yield 1.00 L of solution. The K, of benzoic acid is 6.30 x 10 a) 4.20 b) 3.20 c) 4.50 d) 5.20 @ 10.16 Consider the following table of Ksp values Name Cadmium carbonate Cadmium hydroxide Caldum fluoride Silver iodide Zinc carbonate Formula | Ksp CaCO3 5.2 x 10-12 Ca(OH)2 2.5x 10-14 CaF2 3.9 x 10-11 8.3 x 10-17 ZnCO3 1.4 x 10-11 Ag! 21) Which compound listed above has the greatest molar solubility in water? a) ZnCO; b) Ca(OH)2 Agi CaF et Cocos

Answer 1

18. The poumony buffor system that controls the pH of blood is the carbonic Acid • Bicarbonale Buffor System. Ans is ophion Met A buffer soln (Apecially addic buffer solo) compoires of weak and and its conjugate base. Among Hel, HF, H2, HBr and HNO HF is the coeakest and. This is mainly due sto obbital sizo match of t and f that the H-F bond is strong and this abstraction of the te quite difficult. As Ht is the weakest add among them, er and HF constitutes a buffor solution. & Answer is option 6 2017 The solution is prepared by dissolving 1.5 moles of bonzole aed (HA) and 3 moles of sodium benzoate (A) to yield 12 of soln. -- |[un) , .503 [[m], am] Giveni ka of benzcic acid 6.3x105 log Ka - log (6.3x10-5) pkaa-log (6.3x105) Pkar 4.2

this is a buffer solution troom Henolersom- Haselbach Equation, Hapka s tog [A-] PH 2.4.2 + log lis) pH = 4.2 + loga pH of solution 2 4.50 PH 2.4.50 27 edozi Cacoz t d 24 at 2022 let the molar solubility bey. Kepa (Cd2+) { 1022 ) Repas2 , 512 >10072 252 2.28% 1004) ed (OH), i ed (OH)2 -- ed 24 + 204 let the molar solubility best Kyp: { Cd2+) [6] Kapa s (282 : 43 43. 2.5410 14 »93, 0625x10rl4 625x1095 3 183x1005)

edt in eofy - 21 & 260) let the solar solubility be's. Kep 2 [cod2+] [F-22 Kepa & (28) a 43 413, 3.9x1011 of 83, 0.975*10^" 33, 9.75 X 1012 188, .14 91014 AgI in AgI = Ag*+9 ret the molar solubility be 's'. Kepa (Ag + ] [1^) Kepas2 , 8.341017 32 83x10-18 329.11x1019 In coba Znoz 21+ Com? - let the molar solubility be s. Kep 2 (2024] [ con? ] Kepa S2 14x10-11 822 14x10 12 [32 3.74x10-6 . [Cd Fy has highest molar solubility of 2. Ans is option &