Chemistry: Atoms First
18th Edition
ISBN: 9781938168154
Author: Richard Langley, Klaus Theopold, Paul Flowers
Publisher: OpenStax College
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Chapter 1, Problem 69E
Many medical laboratory tests are run using 5.0
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Calculating the pH at equivalence of a titration
A chemist titrates 210.0 mL of a 0.1003 M hydrobromic acid (HBr) solution with 0.7550M KOH solution at 25 °C. Calculate the pH at equivalence.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH = ]
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Do you do chemistry assignments
Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Chapter 1 Solutions
Chemistry: Atoms First
Ch. 1 - Explain how you could experimentally determine...Ch. 1 - Identify each of the following statements as being...Ch. 1 - Identify each of the following statements as being...Ch. 1 - Identify each of the underlined items as a part of...Ch. 1 - Identify each of the underlined items as a part of...Ch. 1 - According to one theory, the pressure of a gas...Ch. 1 - The amount of heat required to melt 2 lbs of ice...Ch. 1 - Why do we use an objects mass, rather than its...Ch. 1 - What properties distinguish solids from liquids?...Ch. 1 - How does a heterogeneous mixture differ from a...
Ch. 1 - How does a homogeneous mixture differ from a pure...Ch. 1 - How does an element differ from a compound? How...Ch. 1 - How do molecules of elements and molecules of...Ch. 1 - How does an atom differ from a molecule? In what...Ch. 1 - Many of the items you purchase are mixtures of...Ch. 1 - Classify each of the following as an element, a...Ch. 1 - Classify each of the following as an element, a...Ch. 1 - A sulfur atom and a sulfur molecule are not...Ch. 1 - How are the molecules in oxygen gas, the molecules...Ch. 1 - Why are astronauts in space said to be weightless,...Ch. 1 - Prepare a list of the principal chemicals consumed...Ch. 1 - Matter is everywhere around us. Make a list by...Ch. 1 - When elemental iron corrodes it combines with...Ch. 1 - As stated in the text, convincing examples that...Ch. 1 - Yeast converts glucose to ethanol and carbon...Ch. 1 - Classify the six underlined properties in the...Ch. 1 - Classify each of the following changes as physical...Ch. 1 - Classify each of the following changes as physical...Ch. 1 - The volume of a sample of oxygen gas changed from...Ch. 1 - A 2.0-mer volume of hydrogen gas combined with 1.0...Ch. 1 - Explain the difference between extensive...Ch. 1 - Identify the following properties as either...Ch. 1 - The density (d) of a substance is an intensive...Ch. 1 - Is one liter about an ounce, a pint, a quart, or a...Ch. 1 - Is a meter about an inch, a foot, a yard, or a...Ch. 1 - Indicate the SI base units or derived units that...Ch. 1 - Indicate the SI base units or derived units that...Ch. 1 - Give the name and symbol of the prefixes used with...Ch. 1 - Give the name of the prefix and the quantity...Ch. 1 - A large piece of jewelry has a mass of 132.6 g. A...Ch. 1 - Visit this PhET density simulation...Ch. 1 - Visit this PhET density simulation...Ch. 1 - Visit this PhET density simulation...Ch. 1 - Express each of the following numbers in...Ch. 1 - Express each of the following numbers in...Ch. 1 - Indicate whether each of the following can be...Ch. 1 - Indicate whether each of the following can be...Ch. 1 - How many significant figures are contained in each...Ch. 1 - How many significant figures are contained in each...Ch. 1 - The following quantities were reported on the...Ch. 1 - Round off each of the following numbers to two...Ch. 1 - Round off each of the following numbers to two...Ch. 1 - Perform the following calculations and report each...Ch. 1 - Perform the following calculations and report each...Ch. 1 - Consider the results of the archery contest shown...Ch. 1 - Classify the following sets of measurements as...Ch. 1 - Write conversion factors (as ratios) for the...Ch. 1 - Write conversion factors (as ratios) for the...Ch. 1 - The label on a soft drink boule gives the volume...Ch. 1 - The label on a box of cereal gives the mass of...Ch. 1 - Soccer is played with a round ball having a...Ch. 1 - A woman’s basketball has a circumference between...Ch. 1 - How many milliliters of a soft drink are contained...Ch. 1 - A barrel of oil is exactly 42 gal. How many liters...Ch. 1 - The diameter of a red blood cell is about 3104 in....Ch. 1 - The distance between the centers of the two oxygen...Ch. 1 - Is a 197-lb weight lifter light enough to compete...Ch. 1 - A very good 197-Ib weight lifter lifted 192 kg in...Ch. 1 - Many medical laboratory tests are run using 5.0 L...Ch. 1 - If an aspirin tablet Contains 325 mg aspirin, how...Ch. 1 - Use scientific (exponential) notation to express...Ch. 1 - Complete the following conversions between SI...Ch. 1 - Gasoline is sold by the liter in many countries....Ch. 1 - Milk is sold by the liter in many Countries. What...Ch. 1 - A long ton is defined as exactly 2240 lb. What is...Ch. 1 - Make the conversion indicated in each of the...Ch. 1 - Make the conversion indicated in each of the...Ch. 1 - Many chemistry conferences have held a 50-Trillion...Ch. 1 - Many chemistry conferences have held a 50-Trillion...Ch. 1 - The gas tank of a certain luxury automobile holds...Ch. 1 - As an instructor is preparing for an experiment,...Ch. 1 - To prepare for a laboratory period, a student lab...Ch. 1 - A chemistry student is 159 cm tall and weighs 45.8...Ch. 1 - In a recent Grand Prix, the winner completed the...Ch. 1 - Solve these problems about lumber dimensions. To...Ch. 1 - The mercury content of a stream was believed to be...Ch. 1 - Calculate the density of aluminum if 27.6 cm3 has...Ch. 1 - Osmium is one of the densest elements known. What...Ch. 1 - Calculate these masses. What is the mass of 6.00...Ch. 1 - Calculate these masses. What is the mass of 4.00...Ch. 1 - Calculate these volumes. What is the volume of 25...Ch. 1 - Calculate these volumes. What is the volume of...Ch. 1 - Convert the boiling temperature of gold, 2966 C,...Ch. 1 - Convert the temperature of scalding water, 54 C,...Ch. 1 - Convert the temperature of the coldest area in a...Ch. 1 - Convert the temperature of dry ice, 77 C, into...Ch. 1 - Convert the boiling temperature of liquid ammonia....Ch. 1 - The label on a pressurized can of spray...Ch. 1 - The weather in Europe was unusually warm during...
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