5 a solution of aniline c6h5nh2 kb 42 1010 has a ph of 875 at 25oc what was the initial concentr

First, we need to find the pOH of the aniline solution since we are given the pH. We know that p

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5. A solution of aniline (C6H5NH2, Kb = 4.2 × 10^–10) has a pH of 8.75 at 25°C. What was the initial concentration of aniline? A) 1.8 × 10^–9 M C) 7.7 × 10^–2 M E) 5.6 × 10^–6 M B) 9.3 × 10^–9 M D) 4.2 × 10^–10 M 4. What is the equilibrium concentration of H2C2O4 in a 0.230 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10^–2 and Ka2 = 5.1 × 10^–5. A) 1.4 × 10^–1 M C) 2.3 × 10^–1 M B) 1.1 × 10^–1 M D) 5.1 × 10^–5 M E) 8.9 × 10^–2 M 7. Which of the following salts is most likely to form an aqueous solution having the pH shown in the figure? *the pH in the figure is 4.55 a) NH4Cl C) K2CO3 E) LiNO3 B) NaBr D) RbCN 3. What is the hydroxide-ion concentration of a 0.240 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10^–2 and Ka2 = 5.1 × 10^–5. A) 2.9 × 10^–12 M C) 3.5 × 10^–3 M E) 1.0 × 10^–7 M B) 8.6 × 10^–14 M D) 1.1 × 10^–13 M

          5. A solution of aniline (C6H5NH2, Kb = 4.2 × 10^–10) has a pH of 8.75 at 25°C. What was the initial concentration of aniline?
A) 1.8 × 10^–9 M C) 7.7 × 10^–2 M E) 5.6 × 10^–6 M
B) 9.3 × 10^–9 M D) 4.2 × 10^–10 M

4. What is the equilibrium concentration of H2C2O4 in a 0.230 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10^–2 and Ka2 = 5.1 × 10^–5.
A) 1.4 × 10^–1 M C) 2.3 × 10^–1 M
B) 1.1 × 10^–1 M D) 5.1 × 10^–5 M
E) 8.9 × 10^–2 M

7. Which of the following salts is most likely to form an aqueous solution having the pH shown in the figure?
*the pH in the figure is 4.55
a) NH4Cl C) K2CO3 E) LiNO3 B) NaBr D) RbCN

3. What is the hydroxide-ion concentration of a 0.240 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10^–2 and Ka2 = 5.1 × 10^–5.
A) 2.9 × 10^–12 M C) 3.5 × 10^–3 M E) 1.0 × 10^–7 M
B) 8.6 × 10^–14 M D) 1.1 × 10^–13 M

Added by Jason W.

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