Chemistry (OER)
2nd Edition
ISBN: 9781947172616
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 14, Problem 86E
Explain why a buffer can be prepared from a mixture of NH4Cl and NaOH but not from NH3 and NaOH.
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Chapter 14 Solutions
Chemistry (OER)
Ch. 14 - Write equations that show NH3 as both a conjugate...Ch. 14 - Write equations that show H2PO4- acting both as an...Ch. 14 - Show by suitable net ionic equations that each of...Ch. 14 - Show by suitable net ionic equations that each of...Ch. 14 - Show by suitable net ionic equations that each of...Ch. 14 - Show by suitable net ionic equations that each of...Ch. 14 - What is the conjugate acid of each of the...Ch. 14 - What is the conjugate acid of each of the...Ch. 14 - Identify and label the Bronsted-Lowry acid, its...Ch. 14 - Identify and label the Bronsted-Lowry acid, its...
Ch. 14 - What are amphiprotic species? Illustrate with...Ch. 14 - State which of the following species are...Ch. 14 - State which of the following species are...Ch. 14 - Is the self-ionization of water endothermic or...Ch. 14 - Explain why a sample of pure water at 40 C is...Ch. 14 - The ionization constant for water (Kw) is 2.91014...Ch. 14 - The ionization constant for water (Kw) is...Ch. 14 - Calculate the pH and the pOH of each of the...Ch. 14 - Calculate the pH and the pOH of each of the...Ch. 14 - What are the pH and pOH of a solution of 2.0 M...Ch. 14 - What are the hydronium and hydroxide ion...Ch. 14 - Calculate the hydrogen ion concentration and the...Ch. 14 - Calculate the hydronium ion concentration and the...Ch. 14 - The hydronium ion concentration in a sample of...Ch. 14 - The hydroxide ion concentration in household...Ch. 14 - Explain why the neutralization reaction of a...Ch. 14 - Explain why the neutralization reaction of a weak...Ch. 14 - Use this list of important industrial compounds...Ch. 14 - The odor of vinegar is due to the presence of...Ch. 14 - Household ammonia is a solution of the weak base...Ch. 14 - Explain why the ionization constant, Ka, for H2SO4...Ch. 14 - Explain why the ionization constant, Ka, for HI is...Ch. 14 - Gastric juice, the digestive ?uid produced in the...Ch. 14 - Nitric acid reacts with insoluble copper (II)...Ch. 14 - What is the ionization constant at 25 C for the...Ch. 14 - What is the ionization constant at 25 C for the...Ch. 14 - Which base, CH3NH2 or (CH3)2NH, is the stronger...Ch. 14 - Which is the stronger acid, NH4+ or HBrO?Ch. 14 - Which is the stronger base, (CH3)3N or H2BO3-?Ch. 14 - Predict which acid in each of the following pairs...Ch. 14 - Predict which compound in each of the following...Ch. 14 - Rank the compounds in each of the following groups...Ch. 14 - Rank the compounds in each of the following groups...Ch. 14 - Both HF and HCN ionize in water to a limited...Ch. 14 - The active ingredient formed by aspirin in the...Ch. 14 - What do we represent when we write:...Ch. 14 - Explain why equilibrium calculations are not...Ch. 14 - Are the concentrations of hydronium ion and...Ch. 14 - What two common assumptions can simplify...Ch. 14 - What two common assumptions can simplify...Ch. 14 - Which of the following will increase the percent...Ch. 14 - Which of the following will increase the percent...Ch. 14 - What is the effect on the concentrations of NO2-,...Ch. 14 - What is the effect on the concentration of...Ch. 14 - Why is the hydronium ion concentration in a...Ch. 14 - From the equilibrium concentrations given,...Ch. 14 - From the equilibrium concentrations given,...Ch. 14 - Determine Kb for the nitrite ion, NO2-. In a...Ch. 14 - Determine Ka for hydrogen sulfate ion, HSO4-. In a...Ch. 14 - Calculate the ionization constant for each of the...Ch. 14 - Calculate the ionization constant for each of the...Ch. 14 - For which of the following solutions must we...Ch. 14 - Even though both NH3 and C6H5NH2 are weak bases,...Ch. 14 - Calculate the equilibrium concentration of the...Ch. 14 - Calculate the equilibrium concentration of the...Ch. 14 - Calculate the equilibrium concentration of the...Ch. 14 - Calculate the equilibrium concentration of the...Ch. 14 - Using the Ka value of , place Al(H2O)63+ in the...Ch. 14 - Calculate the concentration of all solute species...Ch. 14 - Propionic acid, C2H5CO2H (Ka=1.34105), is used in...Ch. 14 - White vinegar is a 5.0% by mass solution of acetic...Ch. 14 - The ionization constant of lactic acid,...Ch. 14 - Nicotine, C10H14N2, is a base that will accept two...Ch. 14 - The pH of a 0.20-M solution of HP is 1.92....Ch. 14 - The pH of a 0.15-M solution of HSO4- is 1.43....Ch. 14 - The pH of a 0.10-M solution of caffeine is 11.16....Ch. 14 - Tile pH of a solution of household ammonia, a...Ch. 14 - Determine whether aqueous solutions of the...Ch. 14 - Determine whether aqueous solutions of the...Ch. 14 - Novocaine, C13H21O2N2Cl, is the salt of the base...Ch. 14 - Which of the following concentrations would be...Ch. 14 - Calculate the concentration of each species...Ch. 14 - Calculate the concentration of each species...Ch. 14 - Salicylic acid, HOC6H4CO2H, and its derivatives...Ch. 14 - The ion HTe- is an amphiprotic species; it can act...Ch. 14 - Explain why a buffer can be prepared from a...Ch. 14 - Explain why the pH does not change significantly...Ch. 14 - Explain why the pH does not change significantly...Ch. 14 - What is [H3O+] in a solution of 0.25 M CH3CO2H and...Ch. 14 - What is [H3O+] in a solution of 0.075 M HNO2 and...Ch. 14 - What is [OH-] in a solution of 0.125 M CH3NH2 and...Ch. 14 - What is [OH-] in a solution of 1.25 M NH3 and 0.78...Ch. 14 - What concentration of NH4NO3 is required to make...Ch. 14 - What concentration of NaF is required to make...Ch. 14 - What is the effect on the concentration of acetic...Ch. 14 - What is the effect on the concentration of...Ch. 14 - What will be the pH of a buffer solution prepared...Ch. 14 - Calculate the pH of a buffer solution prepared...Ch. 14 - How much solid NaCH3CO23H2O must be added to 0300...Ch. 14 - What mass of NH4Cl must be added to 0.750 L of a...Ch. 14 - A buffer solution is prepared from equal volumes...Ch. 14 - A 5.36-g sample of NH4Cl was added to 25.0 mL of...Ch. 14 - Which acid in Table 14.2 is most appropriate for...Ch. 14 - Which acid in Table 14.2 is most appropriate for...Ch. 14 - Which base in Table 14.3 is must appropriate for...Ch. 14 - Which base in Table 14.3 is most appropriate for...Ch. 14 - Saccharin, C7H4NSO3H, is a weak acid (Ka=2.1102)....Ch. 14 - What is the pH of 1.000 L of a solution of 100.0 g...Ch. 14 - Explain how to choose the appropriate acid-base...Ch. 14 - Explain why an acid-base indicator changes color...Ch. 14 - Why can we ignore the contribution of water to the...Ch. 14 - Why can we ignore the contribution of water to the...Ch. 14 - Draw a curve for a series of solutions of HF. Plot...Ch. 14 - Draw a curve similar to that shown in Figure 14.23...Ch. 14 - Calculate the pH at the following points in a...Ch. 14 - The indicator dinitrophenol is an acid with a Ka...
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- Identify each pair that could form a buffer. (a) HCl and CH3COOH (b) NaH2PO4 and Na2HPO4 (c) H2CO3 and NaHCO3arrow_forwardA friend asks the following: Consider a buffered solution made up of the weak acid HA and its salt NaA. If a strong base like NaOH is added, the HA reacts with the OH to form A. Thus the amount of acid (HA) is decreased, and the amount of base (A) is increased. Analogously, adding HCI to the buffered solution forms more of the acid (HA) by reacting with the base (A). Thus how can we claim that a buffered solution resists changes in the pH of the solution? How would you explain buffering to this friend?arrow_forwardExplain why barium fluoride dissolves in dilute hydrochloric acid but is insoluble in water.arrow_forward
- 8-71 Explain why you do not need to know the chemical formula of a buffer compound to use it.arrow_forwardA quantity of 0.25 M sodium hydroxide is added to a solution containing 0.15 mol of acetic acid. The final volume of the solution is 375 mL and the pH of this solution is 4.45. a What is the molar concentration of the sodium acetate? b How many milliliters of sodium hydroxide were added to the original solution? c What was the original concentration of the acetic acid?arrow_forwardWhat is the pH of a buffer that is 0.150 M in a weak acid and 0.150 M in the acids conjugate base? The acids ionization constant is 6.8 106.arrow_forward
- A quantity of 0.15 M hydrochloric acid is added to a solution containing 0.10 mol of sodium acetate. Some of the sodium acetate is converted to acetic acid, resulting in a final volume of 650 mL of solution. The pH of the final solution is 4.56. a What is the molar concentration of the acetic acid? b How many milliliters of hydrochloric acid were added to the original solution? c What was the original concentration of the sodium acetate?arrow_forwardA solution of weak base is titrated to the equivalence point with a strong acid. Which one of the following statements is most likely to be correct? a The pH of the solution at the equivalence point is 7.0. b The pH of the solution is greater than 13.0. c The pH of the solution is less than 2.0. d The pH of the solution is between 2.0 and 7.0. e The pH of the solution is between 7.0 and 13.0. The reason that best supports my choosing the answer above is a Whenever a solution is titrated with a strong acid, the solution will be very acidic. b Because the solution contains a weak base and the acid (titrant) is used up at the equivalence point, the solution will be basic. c Because the solution contains the conjugate acid of the weak base at the equivalence point, the solution will be acidic.arrow_forwardA solution made up of 1.0 M NH3 and 0.50 M (NH4)2SO4 has a pH of 9.26. a Write the net ionic equation that represents the reaction of this solution with a strong acid. b Write the net ionic equation that represents the reaction of this solution with a strong base. c To 100. mL of this solution, 10.0 mL of 1.00 M HCl is added. How many moles of NH3 and NH4+ are present in the reaction system before and after the addition of the HCl? What is the pH of the resulting solution? d Why did the pH change only slightly upon the addition of HCl?arrow_forward
- Two samples of 1.00 M HCl of equivalent volumes are prepared. One sample is titrated to the equivalence point with a 1.00 M solution of sodium hydroxide, while the other sample is titrated to the equivalence point with a 1.00 M solution of calcium hydroxide. a Compare the volumes of sodium hydroxide and calcium hydroxide required to reach the equivalence point for each titration. b Determine the pH of each solution halfway to the equivalence point. c Determine the pH of each solution at the equivalence point.arrow_forwardIdentify each pair that could form a buffer. (a) NaOH and NaCl (b) NaOH and NH3 (c) Na3PO4 and Na2HPO4arrow_forward
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