Find the pH of the two equivalence points and the volume (mL) of 0.487 M HNO 3 needed to
reach them in the titration of 0.188 L of 0.250M ethylenediamine (H 2 NCH 2 CH 2 NH 2 ).
The balanced chemical equations are
HNO 3 (aq ) + H2 NCH 2 CH 2 NH 2
The Rate Laws
We are interested to know how the rate of reaction depends on the concentrations of
reactants. When chemical reaction takes place, the concentrations of reactants and
products change continuously during the course of the life-span of the rea
The beakers shown contain 0.300 L of aqueous solutions of a moderately weak acid HY. Each
particle represents 0.028 mol; solvent molecules are omitted for clarity. Protons are smaller
and light blue. Oxygen atoms are red. Therefore, hydronium ions are red
Archeologists can determine the age of artifacts made of wood or bone by measuring the
amount of the radioactive isotope
C present in the object. The amount of isotope decreases
in a firstorder process. If 21.0% of the original amount of
C is presen
A voltaic cell is constructed with an Ag/Ag halfcell and a Pb/Pb halfcell. The silver
electrode is positive. Write the balanced halfreactions and the overall reaction.Include the
phases of each reactant and product.
In a voltaic cell, the pos
Balance the following skeleton reaction and identify the oxidizing and reducing agents:
Include the states of all reactants and products in your balanced equation. You do not need to
include the states with the identities of the oxidizing and reducing age
The flask (below) represents the products of the titration of 25 mL of sulfuric acid with
25 mL of sodium hydroxide.
(a) Write balanced molecular, total ionic, and net ionic equations for the reaction. Include the
state of each component in the equations.
CHM 116 Spring 2012
Read Sec. 16.1, 16.2, 16.3
Read Sec. 16.4, 16.5
You should be able to:
Express rates of reaction with regard
to reactant or product concentration
Express rate laws.
An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol
(d = 1.114 g/mL; M = 62.07 g/mol) and water ( d = 1.00 g/mL) at 20 C. The density of the
mixture is 1.070 g/mL.
Express the concentration of ethylene glycol as
For the simple decomposition reaction
AB( g )
A(g ) + B(g )
rate = k [AB] and k = 0.05 L/mol s. How long will it take for [AB] to reach 1/3 of its initial
concentration of 1.50 M ?
The rate expression indicates that this reaction is second order
A mixture of bases can sometimes be the active ingredient in antacid tablets. If 0.4808 g of a
mixture of Al(OH)3 and Mg(OH)2 is neutralized with 17.15 mL of 1.000 M HNO 3 , what is
the mass % of Al(OH)3 in the mixture?
Write the balanced chemical
A 35.00mL solution of 0.2500 M HF is titrated with a standardized 0.1265 M solution of
NaOH at 25 C.
(a) What is the pH of the HF solution before titrant is added?
(b) How many milliliters of titrant are required to reach the equivalence point?
(c) What i
A chemical engineer studying the properties of fuels placed 1.690 g of a hydrocarbon in the
bomb of a calorimeter and filled it withO2 gas . The bomb was immersed in 2.550 L of water
and the reaction initiated. The water temperature rose from20.00C to 23.
The following scenes represent three weak acids HA (where A = X, Y, or Z) dissolved in water
(H2 O is not shown):
(a) Rank the acids in order of increasing K a .
(b) Rank the acids in order of increasing p K a .
(c) Rank the conjugate bases in order of in
Find the H 3 O concentration and D3 O concentration of water and heavy water in the
(a) K w = 1.13910
at 0 C, and 5.47410
at 50 C.
(b) The autoionization constant for heavy water (deuterium oxide, D2 O) is 3.6410
at 0 C and 7.89
The rate constant for the
elementary reaction A B is
_ the rate constant
for the reverse elementary
reaction B A.
a. less than
b. the same as
c. greater than
d impossible to compare to
without additional information
e. a man with
Tuesday, 6:30 PM
Total Points = 120
March 8, 2016
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