Question

please show show work, very confused! will RATE

Problem 1. You are asked to prepare a pH = 10.0 buffer starting from 517 mL of water to which 21.8 g of ammonia have been added. The buffer will be prepared by the addition of ammonium chloride. The Kb of ammonia add to water is 1.99x105. Assume that the volume does not change on the addition of ammonia or ammonium chloride. (a) Write the balanced net ionic equation for ammonia added to water. (b) What is the pH of the initial ammonia solution? (C) How many grams of ammonium chloride should be added to prepare the buffer. Problem 2. Calculate AG FeCl(s) AH; (0) -90.4 , in kl, at 298 K for the following reaction given the indicated information. + H2(g) → Fe(s) + 2 HCl(g) 0.0 -46.6 56.2 192.2 193.8 207.4 sº (mor) 215.3

Answer 1

NH₃ + H₂O È Nutton CNH] mass of NH3 molar mass of wh volume of solution (in) 2 21-89 x 1 1700319 517 mexigl mol z 1-28 males why 2 12.48 M) - 2.476. 5178103 Nhz + H2O Nhat ton 0 X 7 2.48m C -* E 2-48-x X X2 (negled & as 16 (103) Kya (NHGT) (ot) CNH] 199x105 2-480 2) x 2 Con) J 199x105 x 2:48 2 0-007025 m. 2) pon a -log [o-00702s 2 2.153 2) pr a 14.000 - 2.153 2 11.847 = 11.85 - 14-000 - porn c) we want to prepare butter pH, 10-0 plat e ка* к, 2 tоох ч calculate 2 1.000 1014 25.03 x 10 =) Ka 1-99x103

apka – 19 (563x1080) & 9.298 pH = pka + 10 (base) Card) Base is N1 acle is Mut. (consugate and 40-0 29-298 +log Ca ase) => 10 [cave) 2 0.702 2) Coase a 10° 0.702,8 ~ we know Coase) 2 (NH₃) 2 2.48 2 2.476 -) (2476) z S-40x6 5-01 Carro Cacid) = 2 (Nhut 2) [Nhuh moles of NHy cl 0-494m added a Molarity of NHCl volume water (in 2 OS X 517m x630 m 2 0-255398 moles mass of NHill x molar mass 2 moles 2 0-255398 moves x 53-491 9 rmol 13-669 2 113-79] Nucl should be added to prepare buffer. On an a ag of Fles) + 2048 of Hell) – Calf of Fecko) 2 -46-6 10 & 2 (562 kg) +90-4 XIimos 2 156.2 kJ/mol oson a[so of Fe (s) + 2 (30 of 1 )-(s of sech too) a 193-8 metic & 2 (2074 I 215-35 -192-2 3 more 2011 Jirolu 2

862 Dlh yn - Touran 2 156.2 10 2 - (298 16) ( 2010-10 x 1536 ) z 96.2722 ve 2196.3 hodin 1J 963 kJ - 22 mol