5. What is the approximate pll of a D.1 MNHa) solution ?) ? C) 7 D) 11 E) 13 hax

Question

5. What is the approximate pll of a D.1 MNHa) solution ?) ? C) 7 D) 11 E) 13 hax is the hydroxide-ion concentration at equilibrium in a 0.13 M solution of ethylamine (C:H,NHs K-4.7x 104) at 25 C? A) 1.3 x 10- M 6 W B) 7.7x 10-A C) 7.6 x 10M D) 1.3 x 10-12 M E) 6.2x 102M of water shown in the beakers below. In which solution will the percent ionization of the acid be the lowest? 7. Equal moles of the indicated acids are dissolvod in the amounts IV A) I B) II C) III E) All have equal percent ionization of acid. Which of the following indicators is most suitable for the titration of a 25.00-ml sample of 0.140 M propionic acid, HCsHs02, with strong base? A) methyl orange (transition pH range: 3.1-4.4) B) methyl red (transition pH range: 4.2-6.3) C) bromothymol blue (transition pH range: 6.2-7.6) D) thymol blue (transition pH range: 8.0-9.6) E) alizarin yellow (transition pH range: 10.0-12.0) 8. Page 2

Explanation / Answer

5) NH3 is a base and formula for pH = 1/2 {14 + pKa + log [NH3]}
pKa for NH3 = 9.22

   pH = 1/2 { 14 + 9.22 + log [0.1]} = 1/2 {14 + 9.22 -1} = 11.11
Option D is the nearest answer.

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