Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry
15th Edition
ISBN: 9781269935678
Author: Nivaldo J. Tro
Publisher: Pearson Education
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Textbook Question
Chapter 18, Problem 8E
What factors influence the effectiveness of a buffer? What are the characteristics of an effective buffer?
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Buffers usually are composed of:
Weak acids and conjugate bases
Weak acids and weak bases
Weak acids and conjugate acids
98.
Which of the following leads to an overall decrease in energy of a system?
Freezing
Sublimation
Melting
Vaporization
How does a buffer solution prevent larger change in pH? What does it mean when a solution has exceeded the buffer capacity?
Consider the buffer system of carbonic acid (H₂CO₂) and its salt, KHCO₂, which provides the conjugate base, HCO,.
H_COjlog) + HJO W 7 HyO" loạ) + HCOy loa)
How does the buffer react when some base is added?
The bicarbonate ion (HCO) of the buffer reacts with the base.
OHCO and H₂CO, both react with the base.
O The buffer does not react.
O The carbonic acid (H₂CO₂) of the buffer reacts with the base
Question 15
Indicate whether each of the following reactions is an example of reaction of an acid with a metal, reaction of an acid with a carbonate, or acid-base
neutralization reaction using the dropdown on the right.
Reaction A:
ZnCO3(s) + 2HBr(aq) → ZnBr₂(aq) + CO₂(g) + H₂O(l)
Reaction B:
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
HCI(g) + NaHCO3(s)→ NaCl(aq) + CO₂(g) + H₂O(0)
H₂SO4(aq) + Mg(OH)2(s)→ MgSO4(aq) + 2H₂O(1)
3LIOH(aq) + H₂PO₂(aq) → Li₂PO₂(aq) + 3H₂O(0)
Cal(s) + H₂SO4(aq) → H₂(g) + CaSO₂(aq)
Reaction C:
Reaction D:
Reaction E:
Reaction E
Chapter 18 Solutions
Chemistry: Structure and Properties Custom Edition for Rutgers University General Chemistry
Ch. 18 - A buffer is 0.100 M in NH4CI and 0.100 M in NH3....Ch. 18 - What is the pH of a buffer that is 0.120 M in...Ch. 18 - Prob. 3SAQCh. 18 - Prob. 4SAQCh. 18 - Prob. 5SAQCh. 18 - Prob. 6SAQCh. 18 - Prob. 7SAQCh. 18 - A 10.0-mL sample of 0.200 M hydrocyanic acid (HCN)...Ch. 18 - Prob. 9SAQCh. 18 - Prob. 10SAQ
Ch. 18 - Prob. 11SAQCh. 18 - Prob. 12SAQCh. 18 - Calculate the molar solubility of magnesium...Ch. 18 - Prob. 14SAQCh. 18 - Prob. 15SAQCh. 18 - What is the pH range of human blood? How is human...Ch. 18 - What is a buffer? How does a buffer work? How does...Ch. 18 - What is the common ion effect?Ch. 18 - What is the HendersonHasselbalch equation, and why...Ch. 18 - What is the pH of a buffer when the concentrations...Ch. 18 - Suppose that a buffer contains equal amounts of a...Ch. 18 - How do you use the Henderson—Hasselbalch equation...Ch. 18 - What factors influence the effectiveness of a...Ch. 18 - What is the effective pH range of a buffer...Ch. 18 - Describe acidbase titration. What is the...Ch. 18 - The pH at the equivalence point of the titration...Ch. 18 - The volume required to reach the equivalence point...Ch. 18 - In the titration of a strong acid with a strong...Ch. 18 - In the titration of a weak acid with a strong...Ch. 18 - The titration of a diprotic acid with sufficiently...Ch. 18 - In the titration of a polyprotic acid, the volume...Ch. 18 - What is the difference between the endpoint and...Ch. 18 - What is an indicator? How can an indicator signal...Ch. 18 - What is the solubility-product constant? Write a...Ch. 18 - What is molar solubility? How do you obtain the...Ch. 18 - How does a common ion affect the solubility of a...Ch. 18 - How is the solubility of an ionic compound with a...Ch. 18 - For a given solution containing an ionic compound,...Ch. 18 - What is selective precipitation? Under which...Ch. 18 - In which of these solutions does HNO2 ionize less...Ch. 18 - A formic acid solution has a pH of 3.25. Which of...Ch. 18 - Solve an equilibrium problem (using an ICE table)...Ch. 18 - Solve an equilibrium problem (using an ICE table)...Ch. 18 - Calculate the percent ionization of a 0.15 M...Ch. 18 - Calculate the percent ionization of a 0.13 M...Ch. 18 - Solve an equilibrium problem (using an ICE table)...Ch. 18 - Solve an equilibrium problem (using an ICE table)...Ch. 18 - A buffer contains significant amounts of acetic...Ch. 18 - A buffer contains significant amounts of ammonia...Ch. 18 - Use the HendersonHasselbalch equation to calculate...Ch. 18 - Use the Henderson—Hasselbalch equation to...Ch. 18 - Use the Henderson—Hasselbalch equation to...Ch. 18 - Use the Henderson—Hasselbaich equation to...Ch. 18 - Calculate the pH of the solution that results from...Ch. 18 - Calculate the pH of the solution that results from...Ch. 18 - Calculate the ratio of NaF to HF required to...Ch. 18 - Calculate the ratio of CH3NH2 to CH3NH3Cl...Ch. 18 - What mass of sodium benzoate should you add to...Ch. 18 - What mass of ammonium chloride should you add to...Ch. 18 - A 250.0-mL buffer solution is 0.250 M in acetic...Ch. 18 - A 100.0-mL buffer solution is 0.175 M in HCIO and...Ch. 18 - For each solution, calculate the initial and final...Ch. 18 - For each solution, calculate the initial and final...Ch. 18 - A 350.0-mL buffer solution is 0.150 in HF and...Ch. 18 - A 100.0-mL buffer solution is 0.100 M ¡n NH3 and...Ch. 18 - Determine whether the mixing of each pair of...Ch. 18 - Determine whether the mixing of each pair of...Ch. 18 - Blood s buffered by carbonic acid and the...Ch. 18 - The fluids within cells are buffered by H2PO4 and...Ch. 18 - Which buffer system is the best choice to create a...Ch. 18 - Which buffer system is the best choice to create a...Ch. 18 - A 500.0-mL buffer solution is 0.100 M in HNO2 and...Ch. 18 - Prob. 58ECh. 18 - The graphs labeled (a) and (b) are the titration...Ch. 18 - Two 25.0-mL samples, one 0.100 M HCI and the other...Ch. 18 - Two 20.0-mL samples, one 0.200 M KOH and the other...Ch. 18 - Prob. 62ECh. 18 - Consider the curve shown here for the titration of...Ch. 18 - Consider the curve shown here for the titration of...Ch. 18 - Consider the titration of a 35.0-mL sample of...Ch. 18 - A 20.0-mL sample of 0.125 M HNO3 is titrated with...Ch. 18 - Consider the titration of a 25.0-mL sample of...Ch. 18 - Prob. 68ECh. 18 - Prob. 69ECh. 18 - Prob. 70ECh. 18 - Consider the titration of a 25.0-mL sample of...Ch. 18 - Prob. 72ECh. 18 - Prob. 73ECh. 18 - Prob. 74ECh. 18 - Prob. 75ECh. 18 - Prob. 76ECh. 18 - Prob. 77ECh. 18 - Prob. 78ECh. 18 - Methyl red has a pKaof 5.0 and is red in its acid...Ch. 18 - Phenolphthalein has a pKaof 9.7. It is colorless...Ch. 18 - Referring to Table 17.1pick an indicator for use...Ch. 18 - Referring to Table 17.1 pick an indicator for use...Ch. 18 - Write balanced equations and expressions for...Ch. 18 - Prob. 84ECh. 18 - Refer to the Kspvalues in Table 17.2 to calculate...Ch. 18 - Prob. 86ECh. 18 - Use the given molar solubilities in pure water to...Ch. 18 - Prob. 88ECh. 18 - Two compounds with general formulas AX and AX2...Ch. 18 - Consider the compounds with the generic formulas...Ch. 18 - Refer to the Ksp value from Table 17.2 to...Ch. 18 - Prob. 92ECh. 18 - Calculate the molar solubility of barium fluoride...Ch. 18 - Prob. 94ECh. 18 - Calculate the molar solubility of calcium...Ch. 18 - Calculate the solubility (in grams per 1.00102 of...Ch. 18 - Is each compound more soluble in acidic solution...Ch. 18 - Is each compound more soluble in acidic solution...Ch. 18 - A solution containing sodium fluoride is mixed...Ch. 18 - A solution containing potassium bromide is mixed...Ch. 18 - Predict whether a precipitate forms if you mix...Ch. 18 - Prob. 102ECh. 18 - Prob. 103ECh. 18 - Prob. 104ECh. 18 - A solution is 0.010 M in Ba2+ and 0.020 M in Ca2+...Ch. 18 - Prob. 106ECh. 18 - A solution is made 1.1103M in Zn(NO3)2 and 0.150 M...Ch. 18 - A 120.0-mL sample of a solution that is 2.8103M in...Ch. 18 - Use the appropriate values of Kspand Kfto find the...Ch. 18 - Prob. 110ECh. 18 - A 1.500-mL solution contains 2.05 g of sodium...Ch. 18 - A solution ¡s made by combining 10.0 ml of 17.5 M...Ch. 18 - A buffer is created by combining 150.0 mL of 0.25...Ch. 18 - A buffer is created by combining 3.55 g of NH3...Ch. 18 - A 1.0-L buffer solution initially contains 0.25...Ch. 18 - A 250.0-mL buffer solution initially contains...Ch. 18 - In analytical chemistry, bases used for titrations...Ch. 18 - A 0.5224-g sample of an unknown monoprotic acid...Ch. 18 - A 0.25-mol sample of a weak acid with an unknown...Ch. 18 - A 5.55-g sample of a weak acid with Ka=1.3104 is...Ch. 18 - A 0.552-g sample of ascorbic acid (vitamin C) is...Ch. 18 - Sketch the titration curve from Problem 121by...Ch. 18 - One of the main components of hard water is CaCO3....Ch. 18 - Gout—a condition that results in joint swelling...Ch. 18 - Pseudogout, a condition with symptoms similar to...Ch. 18 - Calculate the solubility of silver chloride in a...Ch. 18 - Calculate the solubility of CuX ¡n a solution that...Ch. 18 - Aniline, C6H5NH2, is an important organic base...Ch. 18 - The Kbof hydroxylamine, NH2OH is 1.0108 . A buffer...Ch. 18 - Prob. 130ECh. 18 - Prob. 131ECh. 18 - Prob. 132ECh. 18 - What relative masses of dimethyl amine and...Ch. 18 - You are asked to prepare 2.0 L of a HCN/NaCN...Ch. 18 - Prob. 135ECh. 18 - Prob. 136ECh. 18 - Prob. 137ECh. 18 - Prob. 138ECh. 18 - When excess solid Mg(OH)2 is shaken with 1.00 L of...Ch. 18 - Prob. 140ECh. 18 - Calculate the solubility of Au(OH)3 in (a) water...Ch. 18 - Calculate the concentration of I in a solution...Ch. 18 - Prob. 143ECh. 18 - Prob. 144ECh. 18 - Find the pH of a solution prepared from 1.0 L of a...Ch. 18 - Prob. 146ECh. 18 - Prob. 147ECh. 18 - Prob. 148ECh. 18 - Consider three solutions: 0.10 M solution of a...Ch. 18 - Prob. 150ECh. 18 - Prob. 151E
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- What is meant by the capacity of a buffer? Describe a buffer with low capacity and the same buffer with greater capacity.arrow_forwardBriefly describe how a buffer solution can control the pH of a solution when strong acid is added and when strong base is added. Use NH3/NH4Cl as an example of a buffer and HCl and NaOH as the strong acid and strong base.arrow_forwardYou are given the following acidbase titration data, where each point on the graph represents the pH after adding a given volume of titrant (the substance being added during the titration). a What substance is being titrated, a strong acid, strong base, weak acid, or weak base? b What is the pH at the equivalence point of the tiration? c What indicator might you use to perform this titration? Explain.arrow_forward
- What 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_forwardIdentify the buffer system(s)the conjugate acidbase pair(s)present in a solution that contains equal molar amounts of the following: a. HF, KC2H3O2, NaC2H3O2, and NaF b. HNO3, NaOH, H3PO4, and NaH2PO4arrow_forwardUse Le Chátelier's principle to explain what happens to the equilibrium H2O(l)H+(aq)+OH(aq) when a few drops of HCl are added to pure water.arrow_forward
- Explain why even though an aqueous acetic acid solution contains acetic acid and acetate ions, it cannot be a buffer.arrow_forwardTwo 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_forwardFollow the directions of Question 64. Consider two beakers: Beaker A has a weak acid(K a=1105). Beaker B has HCI. The volume and molarity of each acid in the beakers are the same. Both acids are to be titrated with a 0.1 M solution of NaOH. (a) Before titration starts (at zero time), the pH of the solution in Beaker A is the pH of the solution in Beaker B. (b) At half-neutralization (halfway to the equivalence point), the pH of the solution in Beaker A the pH of the solution in Beaker B. (c) When each solution has reached its equivalence point, the pH of the solution in Beaker A the pH of the solution in Beaker B. (d) At the equivalence point, the volume of NaOH used to titrate HCI in Beaker B the volume of NaOH used to titrate the weak acid in Beaker A.arrow_forward
- 7. Describe a buffered solution. Give three examples of buffered solutions. For each of your examples, write equations and explain how the components of the buffered solution consume added strong acids or bases. Why is buffering of solutions in biological systems so important?arrow_forwardIdentify each pair that could form a buffer. (a) HCl and CH3COOH (b) NaH2PO4 and Na2HPO4 (c) H2CO3 and NaHCO3arrow_forwardA 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_forward
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