BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 17, Problem 110IL
Textbook Problem
20 views

What mass of Na3PO4 must be added to 80.0 mL of 0.200 M HCl to obtain a buffer with a pH of 7.75?

Interpretation Introduction

Interpretation:

The mass of Na3PO4 has to be calcualted which is added to 80 mL of 0.200 M HCl to give the buffer solution of pH value equals to 7.75.

Concept introduction:

The reaction between strong base Na3PO4 and  strong acid HCl gives the product Na2HPO4  which is the conjugate acid of Na3PO4. The Na2HPO4 further react with the remaining  HCl and forms NaH2PO4.

The aqueous solution of HCl gives H3O+ which react with Na3PO4 and Na2HPO4.

HCl(aq)+H2O(l)H3O+(aq)+Cl(aq)

The equilibrium between Na3PO4 and H3O+ is written as follows;

Na3PO4(aq)+H3O+(aq)Na2HPO4(aq)+H2O(l)

The equilibrium between Na2HPO4 and H3O+ is written as follows;

Na2HPO4(aq)+H3O+(aq)NaH2PO4(aq)+H2O(l)

The Henderson-Hasselbalch equation relates pH of a buffer with pKa of acid, concentration of conjugate base and concentration of acid. The expression is written as,

pOH=pKb+log[conjugateacid][base] (1)

Explanation of Solution

The calculation for amount of Na3PO4 is done by using Henderson-Hasselbalch equation.

Given:

Refer to table no. 16.2 in the textbook for the value of Kb.

The value of Kb for Na3PO4 is 2.8×102.

The value of Kb for Na2HPO4 is 1.6×107.

Negative logarithm of the Kb value gives the pKb value of the acid

Therefore, pKb value for Na3PO4 is 1.55 and for Na2HPO4 pKb value is 6.80.

The value of pH for the solution is 7.75.

The pOH value of the solution is calculated.

pOH = 147.75=6.25

Therefore, pOH value of the solution is 6.25.

Let x mol of Na3PO4 is added to the HCl solution.

The concentration of HCl solution is 0.200 molL1.

Volume of HCl solution is 0.080 L.

The calculation of moles is done by using the expression,

Numberof moles=concentration(molL1)volume(L)

The ICE table (1) for the reaction between HCl and Na3PO4 is given below,

EquationNa3PO4(aq)+H3O+(aq)H2O(l)+Na2HPO4(aq)Initial(mol)x(0.016)0Change(mol)xx+xAfter reaction(mol)0(0.016x)x

The generated moles of Na2HPO4 that is x mol will further react with remaining  (0.016x)mol of H3O+.

The ICE table (2) for the reaction between H3O+ and Na2HPO4 is given below,

EquationNa2HPO4(aq)+H3O+(aq)H2O(l)+NaH2PO4(aq)Initial(mol)x(0

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Chapter 17 Solutions

Chemistry & Chemical Reactivity
Show all chapter solutions
add
Ch. 17.3 - The titration of 0.100 M acetic acid with 0.100 M...Ch. 17.3 - Calculate the pH after 75.0 mL of 0.100 M HO has...Ch. 17.3 - 1. What is the pH after 25.0 ml of 0.100 M NaOH...Ch. 17.3 - 2. What is the pH at the equivalence point in the...Ch. 17.3 - Use Figure 17.10 to decide which indicator is best...Ch. 17.3 - Phosphate ions are abundant in cells, both as the...Ch. 17.3 - A typical total phosphate concentration in a cell,...Ch. 17.4 - The barium ion concentration, [Ba2+], in a...Ch. 17.4 - Calculate the solubility of AgCN in moles per...Ch. 17.4 - Calculate the solubility of Ca(OH)2 in moles per...Ch. 17.4 - Calculate the solubility of BaSO4 (a) in pure...Ch. 17.4 - 12. Calculate the solubility of Zn(CN)2 at 25°C...Ch. 17.4 - What is the Ksp expression for silver carbonate?...Ch. 17.4 - 2. Using Ksp values, predict which salt in each...Ch. 17.4 - What is the solubility of PbSO4 in water at 25C?...Ch. 17.4 - 4. What is the solubility of PbSO4 in water at...Ch. 17.4 - Which compound should be more soluble in 0.1 MHCl...Ch. 17.5 - Solid Pbl2 (Ksp = 9.8 109) is placed in a beaker...Ch. 17.5 - What is the minimum concentration of I that can...Ch. 17.5 - You have 100.0 mL of 0.0010 M silver nitrate. Will...Ch. 17.5 - 1. Will SrSO4 precipitate from a solution...Ch. 17.6 - Silver nitrate (0.0050 mol) is added to 1.00 L of...Ch. 17.6 - 1. Iron(II) chloride (0.025 mol) is added to 1.00...Ch. 17.7 - Calculate the value of the equilibrium constant,...Ch. 17.7 - 1. What is the equilibrium constant for the...Ch. 17.7 - Approximately 0.10 g of sodium cyanide is fatal to...Ch. 17.7 - What is the minimum volume of 0.0071 M NaCN(aq)...Ch. 17.7 - Use the formation constant of [Au(CN)2] in...Ch. 17.7 - Silver undergoes similar reactions as those shown...Ch. 17.7 - Write a balanced chemical equation for the...Ch. 17 - Does the pH of the solution increase, decrease or...Ch. 17 - Does the pH of the solution increase, decrease, or...Ch. 17 - What is the pH of a solution that consists of 0.20...Ch. 17 - What is the pH of 0.15 M acetic acid to which 1.56...Ch. 17 - What is the pH of the solution that results from...Ch. 17 - What is the pH of the solution that results from...Ch. 17 - What is the pH of the buffer solution that...Ch. 17 - Lactic acid (CH3CHOHCO2H) is found in sour milk,...Ch. 17 - What mass of sodium acetate, NaCH3CO2, must he...Ch. 17 - What mass of ammonium chloride, NH4Cl, must be...Ch. 17 - Calculate the pH of a solution that has an acetic...Ch. 17 - Calculate the pH of a solution that has an...Ch. 17 - What must the ratio of acetic acid to acetate ion...Ch. 17 - What must the ratio of H2PO4 to HPO42 be to have a...Ch. 17 - A buffer is composed of formic acid and its...Ch. 17 - A buffer solution is composed of 1.360 g of KH2PO4...Ch. 17 - Which of the following combinations would be the...Ch. 17 - Which of the following combinations would be the...Ch. 17 - Describe how to prepare a buffer solution from...Ch. 17 - Describe how to prepare a buffer solution from NH3...Ch. 17 - Determine the volume (in mL) of 1.00 M NaOH that...Ch. 17 - Determine the volume (in mL) of 1.00 M HC1 that...Ch. 17 - A buffer solution was prepared by adding 4.95 g of...Ch. 17 - You dissolve 0.425 g of NaOH in 2.00 L of a buffer...Ch. 17 - A buffer solution is prepared by adding 0.125 mol...Ch. 17 - What is the pH change when 20.0 mL of 0.100 M NaOH...Ch. 17 - Phenol, C6H5OH, is a weak organic acid. Suppose...Ch. 17 - Assume you dissolve 0.235 g of the weak acid...Ch. 17 - You require 36.78 mL of 0.0105 M HCl to reach the...Ch. 17 - A titration of 25.0 mL of a solution of the weak...Ch. 17 - Without doing detailed calculations, sketch the...Ch. 17 - Without doing detailed calculations, sketch the...Ch. 17 - You titrate 25.0 mL of 0.10 M NH3 with 0.10 M HCl....Ch. 17 - Using Figure 17.11, suggest an indicator to use in...Ch. 17 - Using Figure 17.11, suggest an indicator to use in...Ch. 17 - Name two insoluble salts of each of the following...Ch. 17 - Name two insoluble salts of each of the following...Ch. 17 - Using the solubility guidelines (Figure 3.10),...Ch. 17 - Predict whether each of the fallowing is insoluble...Ch. 17 - For each of the following insoluble salts, (1)...Ch. 17 - For each of the following insoluble salts, (1)...Ch. 17 - When 1.55 g of solid thallium(I) bromide is added...Ch. 17 - At 20 C, a saturated aqueous solution of silver...Ch. 17 - When 250 mg of SrF2, strontium fluoride, is added...Ch. 17 - Calcium hydroxide, Ca(OH)2, dissolves in water to...Ch. 17 - You add 0.979 g of Pb(OH)2 to 1.00 L of pure water...Ch. 17 - You place 1.234 g of solid Ca(OH)2 in 1.00 L of...Ch. 17 - Estimate the solubility of silver iodide in pure...Ch. 17 - What is the molar concentration of Au+(aq) in a...Ch. 17 - Estimate the solubility of calcium fluoride, CaF2,...Ch. 17 - Estimate the solubility of lead(II) bromide (a) in...Ch. 17 - The Ksp value for radium sulfate, RaSO4, is 4.2 ...Ch. 17 - If 55 mg of lead(II) sulfate is placed in 250 mL...Ch. 17 - Use Ksp values to decide which compound in each of...Ch. 17 - Use Ksp values to decide which compound in each of...Ch. 17 - Calculate the molar solubility of silver...Ch. 17 - Calculate the solubility of silver bromide, AgBr,...Ch. 17 - Compare the solubility, in milligrams per...Ch. 17 - What is the solubility, in milligrams per...Ch. 17 - Calculate the solubility, in moles per liter, of...Ch. 17 - Calculate the solubility, in moles per liter, of...Ch. 17 - Which insoluble compound in each pair should be...Ch. 17 - Which compound in each pair is more soluble in...Ch. 17 - You have a solution that has a lead(II) ion...Ch. 17 - Sodium carbonate is added to a solution in which...Ch. 17 - If the concentration of Zn2+ in 10.0 mL of water...Ch. 17 - You have 95 mL of a solution that has a lead(II)...Ch. 17 - If the concentration of Mg2+ ion in seawater is...Ch. 17 - Will a precipitate of Mg(OH)2 form when 25.0 mL of...Ch. 17 - Zinc hydroxide is amphoteric (Section 16.10). Use...Ch. 17 - Solid silver iodide, AgI, can be dissolved by...Ch. 17 - What amount of ammonia (moles) must be added to...Ch. 17 - Can you dissolve 15.0 mg of AuCl in 100.0 mL of...Ch. 17 - What is the solubility of AgCl (a) in pure water...Ch. 17 - The chemistry of silver(I) cyanide: (a) Calculate...Ch. 17 - In each of the following cases, decide whether a...Ch. 17 - In each of the following cases, decide whether a...Ch. 17 - If you mix 48 mL of 0.0012 M BaCl2 with 24 mL of...Ch. 17 - Calculate the hydronium ion concentration and the...Ch. 17 - Calculate the hydronium ion concentration and the...Ch. 17 - For each of the following cases, decide whether...Ch. 17 - Rank the following compounds in order of...Ch. 17 - A sample of hard water contains about 2.0 103 M...Ch. 17 - What is the pH of a buffer solution prepared from...Ch. 17 - If you place 5.0 mg of SrSO4 in 1.0 L of pure...Ch. 17 - Describe the effect on the pH of the following...Ch. 17 - What volume of 0.120 M NaOH must be added to 100....Ch. 17 - A buffer solution is prepared by dissolving 1.50 g...Ch. 17 - What volume of 0.200 M HCl must be added to 500.0...Ch. 17 - What is the equilibrium constant for the following...Ch. 17 - Calculate the equilibrium constant for the...Ch. 17 - Suppose you eat 28 grams of rhubarb leaves with an...Ch. 17 - The solubility product constant for calcium...Ch. 17 - In principle, the ions Ba2+ and Ca2+ can be...Ch. 17 - A solution contains 0.10 M iodide ion, I, and 0.10...Ch. 17 - A solution contains Ca2+ and Pb2+ ions, both at a...Ch. 17 - Buffer capacity is defined as the number of moles...Ch. 17 - The Ca2+ ion in hard water can be precipitated as...Ch. 17 - Some photographic film is coated with crystals of...Ch. 17 - Each pair of ions below is found together in...Ch. 17 - Each pair of ions below is found together in...Ch. 17 - The cations Ba2+ and Sr2+ can be precipitated as...Ch. 17 - You will often work with salts of Fe3+, Pb2+, and...Ch. 17 - Aniline hydrochloride, (C6H5NH3)Cl, is a weak...Ch. 17 - The weak base ethanolamine. HOCH2CH2NH2, can be...Ch. 17 - For the titration of 50.0 mL of 0.150 M...Ch. 17 - A buffer solution with it pH of 12.00 consists of...Ch. 17 - To have a buffer with a pH of 2.50, what volume of...Ch. 17 - What mass of Na3PO4 must be added to 80.0 mL of...Ch. 17 - You have a solution that contains AgNO3, Pb(NO3)2,...Ch. 17 - Once you have separated the three salts in Study...Ch. 17 - Suggest a method for separating a precipitate...Ch. 17 - Which of the following barium salts should...Ch. 17 - Explain why the solubility of Ag3PO4 can be...Ch. 17 - Two acids, each approximately 0.01 M in...Ch. 17 - Composition diagrams, commonly known as alpha...Ch. 17 - The composition diagram, or alpha plot, for the...Ch. 17 - The chemical name for aspirin is acetylsalicylic...Ch. 17 - Aluminum hydroxide reacts with phosphoric acid to...

Additional Science Textbook Solutions

Find more solutions based on key concepts
Show solutions add
When choosing a beverage, one should __________. a. read the label carefully, especially noting the number of s...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What are the moral implications of using alcohol during pregnancy?

Understanding Nutrition (MindTap Course List)

What is the definition of science?

An Introduction to Physical Science

What evidence can you give that the corona has a very high temperature?

Horizons: Exploring the Universe (MindTap Course List)

What are genomes?

Human Heredity: Principles and Issues (MindTap Course List)

Explain the origin of Okazaki fragments.

Chemistry for Today: General, Organic, and Biochemistry

Review. Two speeding lead bullets, one of mass 12.0 g moving to the right at 300 m/s and one of mass 8.00 g mov...

Physics for Scientists and Engineers, Technology Update (No access codes included)