CHEMISTRY:MOLECULAR..(LL)-PRINT..W/CODE
7th Edition
ISBN: 9781119457282
Author: JESPERSEN
Publisher: WILEY
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Chapter 16, Problem 33PE
For a buffer composed of
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Calculate the pH of a bicarbonate/carbonate buffer in which the concentration of sodium bicarbonate (NaHCO 3) is always 0.20 M, but the concentration of sodium carbonate (Na 2CO 3) corresponds to each of the following values: (a) 0.20 M; (b) 0.40 M; (c) 0.10 M.
The pH of a bicarbonate-carbonic acid buffer is 6.18. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3−). (Ka1 of carbonic acid is 4.2 × 10−7.)
To fill a 500 mL volumetric flask, 40 g of ammonium chloride (NH4Cl) and 3.2 g of ammonia (NH3) are added along with water. Given the Kb of NH3 is 1.8 × 10−5, the pH of this buffer is...
Chapter 16 Solutions
CHEMISTRY:MOLECULAR..(LL)-PRINT..W/CODE
Ch. 16 - Prob. 1PECh. 16 - Practice Exercise 16.2
An aqueous solution of...Ch. 16 - Practice Exercise 16.3
Water draining from old...Ch. 16 - Because rain washes pollutants out of the air, the...Ch. 16 - Practice Exercise 16.5
Find the values of and ...Ch. 16 - Practice Exercise 16.6
Calculate the . (Hint: is...Ch. 16 - Practice Exercise 16.7
Calculate the , and pH in a...Ch. 16 - For each of the following acids, write the...Ch. 16 - For each of the following acids, write the...Ch. 16 - Practice Exercise 16.10 Use Table 16.2 to find all...
Ch. 16 - Practice Exercise 16.11 Two acids, H A and H B,...Ch. 16 - Practice Exercise 16.12 For each of the following...Ch. 16 - Practice Exercise 16.13 Write the ionization...Ch. 16 - Practice Exercise 16.14 The base methylamine...Ch. 16 - Practice Exercise 16.15
The value of for the
Ch. 16 - Practice Exercise 16.16 Salicylic acid reacts with...Ch. 16 - Practice Exercise 16.17 When butter turns rancid,...Ch. 16 - Practice Exercise 16.18 Few substances are more...Ch. 16 - A student planned an experiment that would use...Ch. 16 - Benzoic acid, HC6H5CO2, is a monoprotic add (only...Ch. 16 - Nicotinic acid, HC6H4NO2, is a B vitamin. It is...Ch. 16 - Aniline, C6H5NH2, is a precursor for many dyes...Ch. 16 - Pyridine, C5H5N, is a bad-smelling liquid for...Ch. 16 - Practice Exercise 16.24
Phenol is an acidic...Ch. 16 - Practice Exercise 16.25
Are solutions of acidic,...Ch. 16 - Are solutions of (a)NaNO3,(b)KF,and(c)NH4NO3...Ch. 16 - Practice Exercise 16.27
What is the pH of a...Ch. 16 - What is the pH of a 0.10 M solution of NaNO2?Ch. 16 - Practice Exercise 16.29
If 500.0 mL of a 0.20 M...Ch. 16 - Practice Exercise 16.30
Will an aqueous solution...Ch. 16 - Will an aqueous solution of ammonium nitrite,...Ch. 16 - Acetic acid, HC2H3O2, and sodium acetate, NaC2H3O2...Ch. 16 - For a buffer composed of NH3 and NH4+ (from...Ch. 16 - Practice Exercise 16.34
Calculate the pH of the...Ch. 16 - One liter of buffer is made by dissolving 100.0...Ch. 16 - Practice Exercise 16.36
From Table 16.2 select an...Ch. 16 - A chemist needed an aqueous buffer with a pH of...Ch. 16 - Practice Exercise 16.38
How much will the pH...Ch. 16 - Practice Exercise 16.39
A buffer is prepared by...Ch. 16 - Write the three ionization steps for phosphoric...Ch. 16 - Ascorbic acid (vitamin C) is a diprotic acid,...Ch. 16 - Sodium bicarbonate gives solutions that are...Ch. 16 - What is the pHofa0.20M solution of Na2SO3at25C?...Ch. 16 - Reasoning by analogy from what you learned about...Ch. 16 - When a weak acid such as acetic acid, HC2H3O2, is...Ch. 16 - Suppose we titrate 20.0 mL of 0.100 MHCHO2 with...Ch. 16 - Practice Exercise 16.47
Suppose 30.0 mL of is...Ch. 16 - Write the chemical equation for (a) the...Ch. 16 - How are acidic, basic, and neutral solutions in...Ch. 16 - At 25C, how are the pHandpOH of a solution related...Ch. 16 - Why do chemists use pH notation instead of the...Ch. 16 - Explain how acids and bases suppress the...Ch. 16 - Prob. 6RQCh. 16 - Could you use the p-notation for the concentration...Ch. 16 - List the strong acids.Ch. 16 - 16.9. What chemical property is central to our...Ch. 16 - 16.10. Explain the difference between strength and...Ch. 16 - How are strong bases identified?Ch. 16 - 16.12. Some strong bases can be used to safely...Ch. 16 - Explain why we can ignore the autoionization of a...Ch. 16 - 16.14 Write the general equation for the...Ch. 16 - Which diagram best represents a weak acid? A...Ch. 16 - Why do we use equilibrium constants, KaandKb, for...Ch. 16 - 16.17 Write the chemical equation for the...Ch. 16 - For each of the acids in Review Question 16.17...Ch. 16 - Write the general equation for the ionization of a...Ch. 16 - 16.20 Write the chemical equation for the...Ch. 16 - 16.21 For each of the bases in Review Question...Ch. 16 - The pKa of HCN is 9.31 and that of HF is 3.46....Ch. 16 - Write the structural formulas for the conjugate...Ch. 16 - 16.24 Write the structural formulas for the...Ch. 16 - 16.25 How is percentage ionization defined? Write...Ch. 16 - What criterion do we use to determine whether or...Ch. 16 - For which of the following are we permitted to...Ch. 16 - What is the quadratic formula? When is it...Ch. 16 - Aspirin is acetylsalicylic acid, a monoprotic acid...Ch. 16 - The Kb value of the oxalate ion,...Ch. 16 - Consider the following compounds and suppose that...Ch. 16 - Will an aqueous solution of AICl3 turn litmus red...Ch. 16 - A solution of hydrazinium acetate is slightly...Ch. 16 - Prob. 34RQCh. 16 - To form a buffer, two substances are needed. How...Ch. 16 - Write ionic equations that illustrate how each...Ch. 16 - 16.37. The hydrogen phosphate ion is able to act...Ch. 16 - 16.38. When sulfur dioxide, an air pollutant from...Ch. 16 - Which diagram best describes a diprotic acid with...Ch. 16 - Citric acid, found in citrus fruits, is a...Ch. 16 - What simplifying assumptions do we usually make in...Ch. 16 - 16.42. Write the equations for the chemical...Ch. 16 - What simplifying assumptions do we usually make in...Ch. 16 - Define the terms equivalence point and end point...Ch. 16 - Will the solution be acidic, neutral, or basic at...Ch. 16 - 16.46. Qualitatively, describe how an acid-base...Ch. 16 - 16.47 If you use methyl orange in the titration of...Ch. 16 - 16.48 Using the list of indicators in Table 16.7,...Ch. 16 - 16.49 Calculate the in each of the following...Ch. 16 - Calculate the [OH-],pH,andpOH for each of the...Ch. 16 - Calculate the molar concentrations of H+andOH- in...Ch. 16 - Calculate the molar concentrations of H+andOH- in...Ch. 16 - Calculate the molar concentrations of H+andOH- in...Ch. 16 - Calculate the molar concentrations of H+andOH- in...Ch. 16 - A certain brand of beer had a H+ concentration...Ch. 16 - A soft drink was put on the market with...Ch. 16 - A sample of Windex had a [OH-]=6.310-5molL-1. What...Ch. 16 - 16.58 Bases tend to be used for cleaning. A...Ch. 16 - Prob. 59RQCh. 16 - At the temperature of the human body, 37C, the...Ch. 16 - 16.61 The interaction of water droplets in rain...Ch. 16 - 16.62 Acid rain forms when rain falls through air...Ch. 16 - 16.63 What is the concentration of ? What is the...Ch. 16 - 16.64 What is the concentration of...Ch. 16 - 16.65 A sodium hydroxide solution is prepared by...Ch. 16 - 16.66 A solution was made by dissolving 0.837 g...Ch. 16 - 16.67 A solution of has a measured pH of 11.60....Ch. 16 - A solution of HCl has a pH of 2.50. How many grams...Ch. 16 - 16.69 In a 0.0020 M solution of , how many moles...Ch. 16 - 16.70 In a certain solution of HCl, the ionization...Ch. 16 - A solution was prepared with 2.64 micrograms of...Ch. 16 - What is the pH of a 3.0107M solution of HCl? What...Ch. 16 - 16.73 Rhododendrons are shrubs that produce...Ch. 16 - 16.74 As eggs age, the pH of the egg white...Ch. 16 - Prob. 75RQCh. 16 - The barbiturate ion, C4H3N2O3,hasKb=1.010-10 What...Ch. 16 - Iodic acid, HIO3, has a pKa of 0.77. (a) What arc...Ch. 16 - Lactic acid HC3H5O3, is responsible for the sour...Ch. 16 - *16.79 A 1.0 M solution of acetic acid has a pH of...Ch. 16 - *16.80 A 0.250 M solution of NH3 has a pH of...Ch. 16 - 16.81 A 0.20 M solution of a weak acid, HA, has a...Ch. 16 - 16.82 A 0.15 M Absolution of an acid found in milk...Ch. 16 - A 0.12 M solution of a weak base is 0.012%...Ch. 16 - 16.84 If a weak base is 0.030% ionized in 0.030...Ch. 16 - Iodic acid, HIO3, is an important oxidizing agent...Ch. 16 - 16.86 Chloroacetic acid, , is a stronger...Ch. 16 - 16.87 Ethylamine, , has a strong, pungent odor...Ch. 16 - Hydroxylamine, HONH2, like ammonia, is a Brnsted...Ch. 16 - *16.89 What are the concentrations of all the...Ch. 16 - What are the concentrations of all the solute...Ch. 16 - 16.91 Codeine, a cough suppressant extracted from...Ch. 16 - Pyridine, C5H5N, is a bad-smelling liquid that is...Ch. 16 - A solution of acetic acid has a pH of 2.54. What...Ch. 16 - How many moles of NH3 must be dissolved in water...Ch. 16 - * 16.95 What is the pH of a 0.0050 M solution of...Ch. 16 - *16.96 What is the pH of a 0.020 M solution of...Ch. 16 - The compound para-aminobenzoic acid (PABA) is a...Ch. 16 - 16.98 Barbituric acid, (which we will abbreviate...Ch. 16 - 16.99 Calculate the pH of . What is the centration...Ch. 16 - Calculate the pH of 0.40MKNO2. What is the...Ch. 16 - Calculate the pH of 0.15MCH3NH3Cl. For...Ch. 16 - Calculate the pH of 0.10 M hydrazinium chloride,...Ch. 16 - A 0.18 M solution of the sodium salt of nicotinic...Ch. 16 - 16.104 A weak base B forms the salt , composed of...Ch. 16 - Liquid chlorine bleach is really nothing more than...Ch. 16 - *16.106 The conjugate acid of a molecular base has...Ch. 16 - 16.107 What is the pH of a solution that contains...Ch. 16 - A buffer is prepared containing...Ch. 16 - Rework Review Problem 16.107 using the Kb for the...Ch. 16 - 16.110 Calculate the pH of the buffer in Review...Ch. 16 - By how much will the pH change if 0.025 mol of HCl...Ch. 16 - 16.112 By how much will the pH change if 25.0 mL...Ch. 16 - Certain proteolytic enzymes react in alkaline...Ch. 16 - *16.114 A hydrolytic enzyme consumes moles of...Ch. 16 - *16.115 What are the initial and final pH values...Ch. 16 - *16.116 What are the initial and final pH values...Ch. 16 - How many grams of sodium acetate, NaC2H3O2, would...Ch. 16 - 16.118 How many grams of sodium formate, , would...Ch. 16 - Suppose 30.00 mL of 0.100 M HCl is added to an...Ch. 16 - 16.120 How many milliliters of 0.15 MHCl would...Ch. 16 - Calculate the concentrations of all the solute...Ch. 16 - *16.122 Tellurium, in the same family as sulfur,...Ch. 16 - Calculate the concentrations of all of the solute...Ch. 16 - What is the pH of a 0.25 M solution of arsenic...Ch. 16 - Phosphorous acid, H3PO3, is actually a diprotic...Ch. 16 - 16.126 What is the pH of a 0.20 M solution of...Ch. 16 - Calculate the pH of 0.24MNa2SO3. What are the...Ch. 16 - *16.128 Calculate the pH of . What are the...Ch. 16 - 16.129 Sodium citrate, , is used as an...Ch. 16 - 16.130 What is the pH of a 0.25 M solution of...Ch. 16 - 16.131 What is the pH of a 0.50 M solution of ? In...Ch. 16 - *16.132 The pH of a solution is adjusted to 12.00...Ch. 16 - What is the pH of a solution prepared by mixing...Ch. 16 - *16.134 What is the pH of a solution prepared by...Ch. 16 - 16.135 When 50.0 mL of 0.050 M formic acid, , is...Ch. 16 - 16.136 When 25 mL of 0.12 M aqueous ammonia is...Ch. 16 - *16.137 For the titration of 75.00 mL of 0.1000 M...Ch. 16 - For the titration of 50.00 mL of 0.1000 M ammonia...Ch. 16 - *16.139 Calculate the percentage ionization of...Ch. 16 - *16.140 What is the pH of a solution that is and...Ch. 16 - A solution is prepared by mixing 325 mL of...Ch. 16 - *16.142 A solution is prepared by dissolving 15.0...Ch. 16 - For an experiment involving what happens to the...Ch. 16 - *16.144 Predict whether the pH of is greater...Ch. 16 - *16.145 What is the pH of a M solution of ammonium...Ch. 16 - How many milliliters of ammonia gas measured at...Ch. 16 - HClO4 is a stronger proton donor than HNO3, but in...Ch. 16 - 16.148 The hydrogen sulfate ion, , is a moderately...Ch. 16 - Some people who take megadoses of ascorbic acid...Ch. 16 - 16.150 For the titration of 25.00 mL of 0. ,...Ch. 16 - Below is a diagram illustrating a mixture HFandF-...Ch. 16 - *16.152 How many milliliters of must be added to...Ch. 16 - Milk of magnesia is a suspension of magnesium...Ch. 16 - 16.154 How many milliliters of are needed to...Ch. 16 - 16.155 It was found that 25.20 mL of an solution...Ch. 16 - Suppose 38.0 mL of 0.000200MHCl is added to 40.0...Ch. 16 - *16.157 Suppose 10.0 mL of gas at and 734 torr...Ch. 16 - *16.158 Suppose the HCl described in the preceding...Ch. 16 - *16.159 What is the approximate freezing point of...Ch. 16 - 16.160 What happens to the pH of a solution as it...Ch. 16 - Can the pH of a solution ever have a negative...Ch. 16 - In simplifying our calculations, we were satisfied...Ch. 16 - In the 1950s it was discovered that lakes in the...Ch. 16 - 16.164 Where are buffers found in everyday...Ch. 16 - Why must the acid used for a buffer have a pKa...Ch. 16 - What conjugate acid-base pairs are used to buffer...Ch. 16 - Your blood at 37C needs to be maintained within a...Ch. 16 - Develop a list of the uses of phosphoric acid in...Ch. 16 - What would our pH scale look like if Arrhenius...
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- Briefly 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_forwardWhat is the pH of a solution that consists of 0.20 M ammonia, NH3, and 0.20 M ammonium chloride, NH4Cl?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_forward
- Write the net ionic equation in which the slightly soluble salt barium fluoride, BaF2, dissolves in dilute hydrochloric 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_forwardAn important component of blood is the buffer combination of bicarbonate ion and carbonic acid. Consider blood with a pH of 7.42. a What is the ratio of [H2CO3] to [HCO3]? b What does the pH become if 15% of the bicarbonate ions are converted to carbonic acid? c What does the pH become if 25% of the carbonic acid molecules are converted to bicarbonate ions?arrow_forward
- A 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_forwardIdentify each pair that could form a buffer. (a) NaOH and NaCl (b) NaOH and NH3 (c) Na3PO4 and Na2HPO4arrow_forwardKa for formic acid is 1.7 104 at 25C. A buffer is made by mixing 529 mL of 0.465 M formic acid, HCHO2, and 494 mL of 0.524 M sodium formate, NaCHO2. Calculate the pH of this solution at 25C after 110 mL of 0.152 M HCl has been added to this buffer.arrow_forward
- A buffer is prepared by dissolving 0.0250 mol of sodium nitrite, NaNO2, in 250.0 mL of 0.0410 M nitrous acid, HNO2. Assume no volume change after HNO2 is dissolved. Calculate the pH of this buffer.arrow_forwardWhat is the pH of the solution obtained by titrating 1.30 g of sodium hydrogen sulfate, NaHSO4, dissolved in 50.0 mL of water with 0.175 M sodium hydroxide until the equivalence point is reached? Assume that any volume change due to adding the sodium hydrogen sulfate or to mixing the solutions is negligible.arrow_forward1) A buffer solution contains 0.350 M ammonium bromide and 0.400 M ammonia.If 0.0452 moles of perchloric acid are added to 225 mL of this buffer, what is the pH of the resulting solution ?(Assume that the volume change does not change upon adding perchloric acid)pH = 2) A buffer solution contains 0.320 M hypochlorous acid and 0.383 M potassium hypochlorite.If 0.0405 moles of hydrochloric acid are added to 225 mL of this buffer, what is the pH of the resulting solution ?(Assume that the volume change does not change upon adding hydrochloric acid)pHarrow_forward
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