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The dissociation constant, ka, of a weak acid is 5.9 x 10-6. What is the pKa of the acid?
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- What are the equilibrium concentrations of acetic acid, the acetate ion, and H3O+ for a 0.10 M solution of acetic acid (K2 = 1.8 105)? What is the pH of the solution?A student found in a reference that the pka of a certain weak acid is 2.74. What is the ionization constant of the acid, ka?A solution containing a monoprotic weak acid (HA) that is 8.09% dissociated was found to have a pH of 1.92. What is the concentration of A- at equilibrium? [A] = M What is the concentration of HA at equilibrium? [HA] = M Calculate the pKa for this acid. pK,
- Which solution is closest to the pKa? Calculate the pH of the solutions and the change in pH after adding 5.00 mL of 0.10-mol L-1 NaOH. Calculate the pH of the solutions and the change in pH after adding 5.00 mL of 0.10-mol L-1 HCl. Which solution is most resistant to pH change? Which solution is least resistant to pH change?Solubility of gases in water increases with increasing mass. Explain? What is the relationship between the value of pKa and the strength of a weak acid?If a solution of dissolved acid has pH = 2.5 and the pka for the acid chemical is 4.3 and you measure the concentration of the conjugate []-base to be 10mm, what is the concentration of the acid in the solution? pH = pka + logi [HA]
- Consider a biochemical reaction that is taking place in a 0.1 M buffer. The initial pH is 7.4, and the pKa of the buffer is 7.2. If, in a final reaction volume of 1.0 mL, 10 micromol of protons are generated, what would be the final pH of the solution?Benzoic acid, HC7H502, and its salts are used as food preservatives. Ka for benzoic acid is 6,3 X 1 0 -5 . A solution of sodium benzoate, NaC7H502, in water has a concentration of 0.015 mol.dm-3 .a) What is the equilibrium concentration of benzoic acid in the sodium benzoate solution?b) What is the pH of this solution?Given the pKa of hypochlorous acid, HOCl, is 7.54. What is the pH of a solution which consists of 0.20 M HOCl and 0.70 M OCl-?
- ACID-BASE EQUILIBRIA AND SALT EQUILIBRIA (COMMON-ION EFFECT, BUFFER AND SOLUBILITY EQUILIBRIA) The pH of the given solution of lactic acid and lactate is 5.24. Calculate the pKa of lactic acid, when the concentration of lactic acid and lactate are 0.024 M and 0.087 M respectively.10. What is the pH of a buffer solution that contains 0.245 M weak acid and 0.450 M of the conjugate base? The pKa for the acid is 5.53.The pKa of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.30 M and its conjugate base at 0.30 M. The measured pH was 8.0. What is the pKa of the weak acid?