Concept explainers
(a)
Interpretation:
The
Concept Introduction:
According to
(b)
Interpretation:
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Concept Introduction:
The buffer is a solution that resists any change in pH on addition of
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Chemistry: The Molecular Science
- What is the pH of a solution that has an H+ concentration of (a) 1.75 × 10 –5 mol/L; (b) 6.50 × 10 –10 mol/L; (c) 1.0 × 10 –4 mol/L; (d) 1.50 × 10 –5 mol/L?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_forward(A) Consider a solution of 1.34×10-3 M hydrochloric acid. What would be the hydrogen ion concentration of this solution? And the pH?arrow_forward
- Propionic 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_forward- pH of Saliva The pH of saliva is normally in the range of 6.4 to 7.0. However, when a person is ill, the person's saliva becomes more acidic. (a) When Marco is sick, he tests the pH of his saliva and finds that it is 5.5. What is the hydrogen ion concentra- tion of his saliva? (b) Will the hydrogen ion concentration in Marco's saliva increase or decrease as he gets better? (c) After Marco recovers, he tests the pH of his saliva, and it is 6.5. Was the saliva more acidic or less acidic when he was sick?arrow_forwardA 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
- Calculate the pH and pOH of the following substances: 1. 0.3 M sulfuric acid (H2SO4) solution 2. 0.125 M potassium hydroxide (KOH) solution 3. 0.8 M hypochlorous acid (HCIO) solution (Ka = 2.9 x 10-8) 4. 0.5 M aniline (C6H5NH2) solution (Kb = 3.8 x 10-10)arrow_forwardA conjugate acid (HA) and its conjugate base (A") is mixed to make buffer solutions. When 0.50 mol HA and 0.50 mol A are mixed into 1.00 L solution, the pH of the solution is 4.87. Calculate the pH of the buffer solution by mixing 0.25 mol HA and 0.75 mol A into 1.00 L solution. Your pH value should have the form of XXX, XX.X, X.XX or 0.XXX.arrow_forwardYou are studying a clear solution and you added the pH indicator methyl violet. The colour range of the indicator methyl violet in a clear solution when changing from acidic to basic is yellow (pH 0) to blue purple (pH 1) to violet (pH 2). You initial pH of the solution when tested with a pH meter is O.2. You are going to add 250 drops of 0.1 M HCI. Please select the most appropriate answers to the following two questions. What is the initial colour of the solution at pH 0.2? What is the colour of the solution and what will the pH be after the addition of the HCI? Select 2 correct answer(s) The colour of the solution after the addition of HCI will be clear and the pH will be less than 0.2. The colour of the solution after the addition of HCI will be violet and the pH will be higher than 0.2.arrow_forward
- Does the pH of the solution increase, decrease or stay the same when you? (a) add solid ammonium chloride to a dilute aqueous solution of NH3? (b) add solid sodium acetate to a dilute aqueous solution of acetic acid? (c) add solid NaCl to a dilute aqueous solution of NaOH?arrow_forwardThe pH scale for acidity is defined by pH log10 H* where H is the concentration of hydrogen ions measured in moles per liter (M). (A) The pH of egg whites is 8.3. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M (B) The pH of lemon juice is 2.0. Calculate the concentration of hydrogen ions in moles per liter (M). [H+] = Marrow_forward1. Calculate the pH of a 0.594 M aqueous solution of pyridinium chloride, C5H5NHCl. The Kb of pyridine is 1.8 x 10-9. The answer must be given with the correct number of significant figures. 2. How many grams of NaF must be added to 60.0 mL of 0.500 M HF(aq) to adjust the pH to 3.40? Assume no volume change. The pKa of HF is 3.14.arrow_forward
- Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning