a. aniline b. methylamiiie n stron- 99. Calculate aclat tepH of a 0.20-M C,H,NH,

Question

a. aniline b. methylamiiie n stron- 99. Calculate aclat tepH of a 0.20-M C,H,NH, solution (K 5.6× 10-4). Calculate culate the plH of a 0.os0-M (C,Hs),NH solution (K, 1.3 × 10-3). 100. stron- 01. What is th e percent ionization in each of the following solutions? a. 0.10 M NH3 b. 0.010 M NH3 0.10 M CH,NH2 c. 102. Calculate the percentage of pyridine (CsHsN ) that forms pyri- dinium ion, C,HsNH, in a 0.10-M aqueous solution of pyri- dine (Kv = 1.7 × 10-9). 103. The pH of a 0.016-M aqueous solution of p-toluidine (CH,C,H,NH2) is 8.60. Calculate Kb 104. Calculate the mass of HONH, required to dissolve in enough water to make 250.0 mL of solution having a pH of 10.00 (Kb 1.1 × 10-8). Polyprotic Acids 105. Write out the stepwise Ka reactions for the diprotic acid H2SO3 106. Write out the stepwise K, reactions for citric acid (H,CHO) a triprotic acid. 107. A typical vitamin C tablet (containing pure ascorbic acid, HoCH,) weighs 500. mg. One vitamin C tablet is dissolved in enough water to make 200.0 mL of solution. Calculate the pH of this solution. Ascorbic acid is a diprotic acid. 108. Arsenic acid (H3AsO) is a triprotic acid with Kal-5.5 aj in a 0.20-M arsenic acid solution. 109. Calculate the pH and [S2-] in a 0.10-M H,S solution. Assur 19

Explanation / Answer

First of all we should know that in this problem we need to find [OH-] concentration first. And for that it is not necessary to find [H+] concentration, we can find [OH-] without calculating [H+].

Without calculating [H+], we can proceed through following steps to find [OH-] : pOH = 14 - pH = 14 - 10.00 = 4 pOH = - log [OH-] Therefore; [OH-] = 10-4 = 0.0001 M And by calculating [H+], we can proceed through following steps to find [OH-] : pH = - log [H+] then, [H+] = 10-10 M We know; [H+] [OH-] = 10-14 Therefore; [OH-] = 10-14 / 10-10 = 10-4 = 0.0001 M

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