For a weak acid with a pKa of 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0
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For a weak acid with a pKa of 6.0, calculate the ratio of conjugate base to acid at a pH of 5.0
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- Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? the curve is attached below.A solution with a density of 0.876 g>mL contains 5.0 g of toluene 1C7H82 and 225 g of benzene. Calculate the molarity of the solution.Consider the following acids and their ionization constant, determine which conjugate base is HCOOH Ka = 1.7 x 10-4 (b) HCN Ka = 4.9 x 10-10
- What is the pH of a solution of 4.1 x 10-8 M NaOH in otherwise pure water?A 0.10 M solution of the deadly poison hydrogen cyanide, HCN, has a pH of 5.2. Calculate the [H3O+] of the solution. Is HCN a strong or a weak acid?Identify the conjugate acid-base pairs in the following reactions: HNO2(aq) + H2O(l) → NO2 – (aq) + H3O+(aq) _______ ______ _________ ________ CH3NH2 + H2O(l) → CH3NH3+ + OH – _______ ________ ________ _________
- The pH of a solution containing 20 mL of 0.120 N NaOH and 35 mL of 0.120 N NaOH is 1.49. True or False?For an acid HA, the concentrations of HA and A are 0.075 and 0.025, respectively, at pH 6.0. What is the p K a value for HA?Calculate the [H+], [OH-], and pH of the substance with pOH value of 4.82. Determine whether this substance is an acid or a base.
- Assuming equal concentrations of conjugate base and acid, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 7.4–7.6? NaOCl / HOCl (K a = 3.2 × 10 –8) NH 3 / NH 4Cl (K a = 5.6 × 10 –10) NaNO 2 / HNO 2 (K a = 4.5 × 10 –4) NaCl / HCl CH 3COONa / CH 3COOH (K a = 1.8 × 10 –5)Explain how you would prepare 100ml of 10mMProline solution given that the molecular mass of proline= 115.13 g/molCalculate the pH of a mixture of 0.25 M acetic acid and 0.20 M sodium acetate. The pKa of acetic acid is 4.76.
