Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25Â°C.) (a) pH = 4.93 (b) pH = 4.70 (c) pH = 5.26 (d) pH = 5.54

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1.)How many grams of dipotassium succinate trihydrate (K2C4H4O4Â·3H2O, MW = 248.32 g/mol) must be added to 650.0 mL of a 0.0459 M succinic acid solution to produce a pH of 5.822? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

2.)A buffered solution containing dissolved aniline, C6H5NH2, and aniline hydrochloride, C6H5NH3Cl, has a pH of 5.72.
a) Determine the concentration of C6H5NH3 in the solution if the concentration of C6H5NH2 is 0.335 M. The pKb of aniline is 9.13.
b) Calculate the change in pH of the solution, ?pH, if 0.370 g NaOH is added to the buffer for a final volume of 1.60 L. Assume that any contribution of NaOH to the volume is negligible.

3.)A buffer with a pH of 4.10 contains 0.27 M of sodium benzoate and 0.34 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.058 mol of HCl to a final volume of 1.5 L? Assume that any contribution of HCl to the volume is negligible.

Benzoic acid (C₆H₅COOH) and aniline (C₆H₅NH₂) are both derivatives of benzene. Benzoic acid is an acid with K_a = 6.3 × 10^–5 and aniline is a base with K_a = 4.3 × 10^–10.

(a) What are the conjugate base of benzoic acid and the conjugate acid of aniline? (b) Anilinium chloride (C₆H₅NH₃Cl) is a strong electrolyte that dissociates into anilinium ions (C₆H₅NH₃⁺) and chloride ions. Which will be more acidic, a 0.10 M solution of benzoic acid or a 0.10 M solution of anilinium chloride? (c) What is the value of the equilibrium constant for the following equilibrium?