Chemistry Principles And Practice
3rd Edition
ISBN: 9781305295803
Author: David Reger; Scott Ball; Daniel Goode
Publisher: Cengage Learning
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Question
Chapter 4, Problem 4.73QE
Interpretation Introduction
Interpretation:
The molar concentration of
Concept introduction:
Molarity: Dividing moles of solute by the volume of solution in Liter.
Mole: Dividing taken mass substance by molar mass of substance.
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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
Calculating the pH at equivalence of a titration
Try Again
Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
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
=
11.43]
G
00.
18
Ar
B•
Chapter 4 Solutions
Chemistry Principles And Practice
Ch. 4 - Prob. 4.1QECh. 4 - A solution is formed by mixing 1 gal ethanol with...Ch. 4 - An aqueous sample is known to contain either Sr2+...Ch. 4 - Ammonium chloride is a strong electrolyte. Draw a...Ch. 4 - Experiments show that propionic acid (CH3CH2COOH)...Ch. 4 - Describe the procedure used to make 1.250 L of...Ch. 4 - If enough Li2SO4 dissolves in water to make a 0.33...Ch. 4 - Describe how 500 mL of a 1.5 M solution of HCl...Ch. 4 - Addition of water to concentrated sulfuric acid is...Ch. 4 - Draw the flow diagram for a calculation that...
Ch. 4 - Prob. 4.11QECh. 4 - Describe in words the titration of an acid with a...Ch. 4 - Describe the use of gravimetric analysis to...Ch. 4 - Draw the contents of a beaker of water that...Ch. 4 - Prob. 4.15QECh. 4 - Prob. 4.16QECh. 4 - Prob. 4.17QECh. 4 - Prob. 4.18QECh. 4 - Write the net ionic equation for the reaction, if...Ch. 4 - Write the net ionic equation for the reaction, if...Ch. 4 - Prob. 4.21QECh. 4 - Prob. 4.22QECh. 4 - Write the overall equation (including the physical...Ch. 4 - Write the overall equation (including the physical...Ch. 4 - Write the overall equation (including the physical...Ch. 4 - Write the overall equation (including the physical...Ch. 4 - An aqueous sample is known to contain either Pb2+...Ch. 4 - An aqueous sample is known to contain either Ag+...Ch. 4 - An aqueous sample is known to contain either Mg2+...Ch. 4 - An aqueous sample is known to contain either Pb2+...Ch. 4 - In the beakers shown below, the colored spheres...Ch. 4 - In the beakers shown below, the colored spheres...Ch. 4 - Calculate the molarity of KOH in a solution...Ch. 4 - Calculate the molarity of NaCl in a solution...Ch. 4 - Calculate the molarity of AgNO3 in a solution...Ch. 4 - Calculate the molarity of NaOH in a solution...Ch. 4 - What volume of a 2.3 M HCl solution is needed to...Ch. 4 - What volume of a 5.22 M NaOH solution is needed to...Ch. 4 - What volume of a 2.11 M Li2CO3 solution is needed...Ch. 4 - What volume of a 5.00 M H2SO4 solution is needed...Ch. 4 - What is the molarity of a glucose (C6H12O6)...Ch. 4 - If you dilute 25.0 mL of 1.50 M hydrochloric acid...Ch. 4 - Prob. 4.43QECh. 4 - Prob. 4.44QECh. 4 - Prob. 4.45QECh. 4 - Prob. 4.46QECh. 4 - How many grams of AgNO3 are needed to prepare 300...Ch. 4 - What mass of oxalic acid, H2C2O4, is required to...Ch. 4 - Prob. 4.49QECh. 4 - What mass of sodium sulfate, in grams, is needed...Ch. 4 - What is the molarity of a solution of strontium...Ch. 4 - What is the molarity of a solution of sodium...Ch. 4 - What is the molarity of a solution of magnesium...Ch. 4 - If 6.73 g of Na2CO3 is dissolved in enough water...Ch. 4 - The substance KSCN is frequently used to test for...Ch. 4 - Potassium permanganate (KMnO4) solutions are used...Ch. 4 - Two liters of a 1.5 M solution of sodium hydroxide...Ch. 4 - Prob. 4.58QECh. 4 - Prob. 4.59QECh. 4 - Prob. 4.60QECh. 4 - Prob. 4.61QECh. 4 - Prob. 4.62QECh. 4 - Prob. 4.63QECh. 4 - Prob. 4.64QECh. 4 - What volume of 2.4 M HCl is needed to obtain 1.3...Ch. 4 - Prob. 4.66QECh. 4 - Prob. 4.67QECh. 4 - Prob. 4.68QECh. 4 - Prob. 4.69QECh. 4 - Prob. 4.70QECh. 4 - What volume of 0.66 M HNO3 is needed to react...Ch. 4 - What volume of 0.22 M hydrochloric acid is needed...Ch. 4 - Prob. 4.73QECh. 4 - Prob. 4.74QECh. 4 - Prob. 4.75QECh. 4 - Prob. 4.76QECh. 4 - Prob. 4.77QECh. 4 - What mass of iron (III) hydroxide precipitates on...Ch. 4 - Prob. 4.79QECh. 4 - What is the solid that precipitates, and how much...Ch. 4 - What volume of 1.212 M silver nitrate is needed to...Ch. 4 - Prob. 4.82QECh. 4 - A solid forms when excess barium chloride is added...Ch. 4 - Prob. 4.84QECh. 4 - Write the overall equation (including the physical...Ch. 4 - Write the overall equation (including the physical...Ch. 4 - What is the molar concentration of a solution of...Ch. 4 - Prob. 4.88QECh. 4 - What is the molar concentration of an HCl solution...Ch. 4 - What is the molar concentration of an H2SO4...Ch. 4 - Prob. 4.91QECh. 4 - Prob. 4.92QECh. 4 - The pungent odor of vinegar is a result of the...Ch. 4 - Prob. 4.94QECh. 4 - Oranges and grapefruits are known as citrus fruits...Ch. 4 - Prob. 4.96QECh. 4 - Prob. 4.97QECh. 4 - Prob. 4.98QECh. 4 - Prob. 4.99QECh. 4 - Prob. 4.100QECh. 4 - Prob. 4.101QECh. 4 - Prob. 4.102QECh. 4 - Prob. 4.103QECh. 4 - Prob. 4.104QECh. 4 - Prob. 4.105QECh. 4 - Prob. 4.106QECh. 4 - Prob. 4.107QECh. 4 - Prob. 4.108QECh. 4 - Prob. 4.109QECh. 4 - Prob. 4.110QECh. 4 - Prob. 4.115QECh. 4 - Prob. 4.117QECh. 4 - Prob. 4.118QECh. 4 - Prob. 4.119QECh. 4 - Prob. 4.120QECh. 4 - Prob. 4.121QECh. 4 - Prob. 4.122QECh. 4 - Prob. 4.123QE
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