Question

1) a) The decomposition of ammonia is: 2 NHgN(g) +3 H2(g). If the pressure of ammonia is 1.0 x 10-3 atm, and the pressures of N2 and H2 are each 0.20 atm what is the value for K at 400°C for the reverse reaction? d) What is the [CH&COrVICH:CO,H] ratio necessary to make a buffer solution with a pH of 4.44? K 1.8 x 103 for CH3CO2H. What is the pH of a buffer system prepared by dissolving 10.70 grams of NHCl and 30.00 mL of 12 M NH3 in enough water to make 1.000 L of solution? Kb-1.80 x 105 for NHs g) What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous formic acid requires 29. 80 mL of 0.0567 M NaOH??= 1.8 x 1o-for formic acid h) The tolowing plctures represent solutions at various stages in the tration of a weak dipro acd MA with aqueous KOH Unshaded spheres rspresent H atoms, black spheres represent anygen atoms, and shaded spheres present Aions (Kt Hyot inally present OH inially present and solvent waer molecules have been omilted for larity) Which pichure represents the system with the highest pH? (4) The folliowing plctures represent solutions at various points in the ttratdion of a weak aolkd HA with aqueous KOH Unshaded spheres represent H atoms, black spheres represent oxygen atoms, and shaded sphere represent A. ions (K+. Hy0" i tially present ??, Hialy present and schont water mol cules havo been omitted for daity) which picture represents solution before the addition of any KOH?

Answer 1

NH2 (1,0 N 0-3) HA] Coph

-474030 CHLSo 0-30 30.0D ml 10ว้า lou Volume 1nL IL pwd] = 0.36M 36 E 036-2

0.36-х 5 o.36-) 3/5 0-36-0, 0025y 0, 35746 Using Haro OH NH3 OH Kb + .35 74 рон 4.745(214.57 pH=//.yo