Concept explainers
(a)
Interpretation:
The
Concept Introduction:
According to
(b)
Interpretation:
The
Concept Introduction:
The buffer is a solution that resists any change in pH on addition of
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Chemistry: The Molecular Science
- One half liter (500. mL) of 2.50 M HCl is mixed with 250. mL of 3.75 M HCl. Assuming the total solution volume after mixing is 750. mL, what is the concentration of hydrochloric acid in the resulting solution? What is its pH?arrow_forwardPropionic acid, HC3H5O2, has Ka= 1.34 x 10–5. (a) What is the molar concentration of H3O+ in 0.15 M HC3H5O2 and the pH of the solution? (b) What is the Kb value for the propionate ion, C3H5O2–? (c) Calculate the pH of 0.15 M solution of sodium propionate, NaC3H5O2. (d) Calculate the pH of solution that contains 0.12 M HC3H5O2 and 0.25 M NaC3H5O2.arrow_forwardWhen sodium fluoride (NaF) is added to an HF solution, what happens to the pH of the solution and why? (A) The pH will not change because NaF is an ionic compound that is neither acid nor base. (B) The pH will decrease because F– absorbs H+ and decreasing the H3O+(aq) concentration. (C) The pH will increase because F– absorbs H+ and decreasing the H3O+(aq) concentration. (D) The pH will not change because NaF is a neutral compound.arrow_forward
- Given that Ka’s for hydrofluoric acid (HF) and boric acid (H3BO3) are 6.3 × 10^–4 and 5.4 × 10^–10, respectively, calculate the pH of the following solutions: (a) The mixture from adding 50 mL 0.2 M HF to 50 mL 0.5 M sodium borate (NaH2BO3). (b) The mixture from adding an additional 150 mL 0.2 M HF to the solution in (a), i.e., a total of 200 mL 0.2 M HF was added to 50 mL 0.5 M NaH2BO3.arrow_forwardWhen 14.08 mL of 0.1594 M NaOH is added to 25.00 mL of 0.1235 M HX (an unknown weak acid), the resulting pH is 4.7. What is the Ka of the unknown acid?arrow_forwardCalculate the pH change that results when 11 mL of 5.1 M NaOH is added to 796 mL of each the following solutions. (See the Acid-Base Table.) (a) pure water (b) 0.10 M NH4Cl (c) 0.10 M NH3 (d) a solution that is 0.10 M in each NH4+ and NH3arrow_forward
- A student is provided with a 0.1 M stock solution of NaOH. Student was then asked to mix 50.0 mL of this stock solution of NaOH with 450.0 mL of water to prepare a dilute solution of NaOH. (A) Calculate the molarity of the diluted solution. (B). Calculate the hydronium ion concentration, [H3O+] in the final diluted solution. (8 points) (C ) Calculate the pH of the diluted NaOH solution. (D) Is the final diluted solution acidic, basic or neutral?arrow_forward(a) What is the pH of 0.75 M NaF?(b) What is the pH of 0.88 M pyridinium chloride, C₅H₅NHCl?arrow_forwardCalculate the pH change that results when 12 mL of 5.3 M NaOH is added to 768 mL of each the following solutions. (See the Acid-Base Table attached.) (a) pure water (b) 0.10 M NH4Cl (c) 0.10 M NH3(d) a solution that is 0.10 M in each NH4+ and NH3arrow_forward
- 5. The molarity of an aqueous solution of NaOH is 0.0022 M.(a) What is the concentration of H3O+ in this solution?(b) What is the pH of the solution?(c) What is the OH- concentration in the solution?arrow_forwarda) What is the pH of a buffer solution that is made by dissolving 125.5 g of sodium benzoate and 166.9g of benzoic acid in 500 mL of water? (b) What is the pH if you added 26.7 mL of 2.22 M NaOH to 254 mL of the buffer solution from above? (c) What is the pH if you added 32.8 mL of 3.36 M HCl to 354 mL of the buffer solution from above? Dontarrow_forwardWhen 14.08 mL of 0.1594 M NaOH is added to 25.00 mL of 0.1235 M HX (an unknown weak acid), the resulting pH is 4.7. What is the Kaof the unknown acid?arrow_forward
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