Question

Calculate the ionic strength and the average activity coefficient of a solution CaCl2 (aq) 1.00 x 10-3 mol kg-1 at 25 ° C

Answer #1

Estimate the mean ionic activity coefficient and activity of a
solution that is 0.010 mol kg–1 CaCl2(aq) and 0.030 mol kg–1
NaF(aq). Use the Debye-Hückel limiting law.

A)Calculate The activity coefficient of Pb2+ at an ionic strength
of 0.40. What does this value mean? B) determine the solubility of
PbCO3 in the solution of ionic strength of 0.40. (Note the activity
coefficient of the carbonate ion is the same as that for the Pb2+,
why is that?) compare this solubility to the solubility of PbCO3 in
pure water. C) write the mass balance and charge balance equations
for a solution that is 0.20 M in NaF and...

1-Find the grams of KNO3 needed to add to a 0.02 mol kg-1
solution of KNO3(aq) containing 3.52 kg of water to raise its ionic
strength to 0.17.
2- Find the mean ionic activity coefficient for NaCl in a
solution at 25°C that has 0.067 mol kg-1 of NaCl(aq) and 0.160 mol
kg-1 in Ca(NO3)2(aq), in reference to the NaCl.

Estimate the mean ionic activity coefficient and activities of
Na+ and Cl– (originating from NaCl) in a solution that is 0.010 mol
kg–1 NaCl(aq), 0.020 mol kg–1 Na2SO4(aq) and 0.030 mol kg–1
KCl(aq). The three salts undergo complete dissociation. Use the
Debye-Hückel limiting law for aqueous solutions at 25.0 degrees
C.

Assume each salt disassociates 100% a) Calculate the ionic
strength of a 500mM solution of NaCl b) Calculate the ionic
strength of a 500mM solution of CaCl2 c) Discuss your answers to a
and b. Given they are the same concentration are the ionic
strengths equal or different? Explain.

1. Calculate the activity coefficient and activity of each ion
in a solution containing 500 mg/L NaNO3 and 150 mg/L
CaSO4.
2. One gram of solid silver chloride, AgCl(s), is
added to 1.0 L of estuarine water that contains 0.10 mol/L
Cl- and has an ionic strength of 0.12 mol/L. the solid
begins to dissolve according to the following reaction, which has
an equilibrium constant of
10-9.75.
AgCl(s) Ag+ + Cl-
Estimate the mass of AgCl(s) that dissolves per...

State true or false for the folloing statements.
1. The Faraday constant equals the charge of one proton.
2. In the spontaneous chemical reaction of an electrochemical
cell, electrons flow from the anode to the cathode.
3. Increasing the activity of a reactant in the cell's chemical
reaction must increase the cell potential.
4. If we double all the coefficients in a cell's reaction, the
number of electrons transferred, n, is doubled but the
cell potential is unchanged.
5. The...

Taking the activity coefficient effect into consideration,
calculate the concentration of Fe3+ in a solution that
is saturated with Fe4[Fe(CN6]3
(Iron(III) ferrocyanide). The overall ionic strength of the
solution is .01 M.
Iron(III) ferrocyanide Ksp = 3.3*10-41.
The answer starts with 5.90... please show ALL steps

Calculate an individual ion activity coefficient for Ca2+ and
for Na+ . Use an activity coefficient equation of your choice but
be sure to state which one you are using and show your work
(including the constants used for the calculation). Do you think
activity corrections are important for this water? Briefly explain
why or why not. (Ionic Strength = 841 ppm

–What amount of calcium chloride (in moles/liter) should be
added to a 0.02 M solution of neomycin sulfate (1:2 electrolyte) to
produce an ionic strength of 0.09.
Calculate the mean ionic activity and the mean ionic activity
coefficient for the 0.02 M solution of neomycin sulfate at
an ionic strength of 0.09 and a temperature of 25 ◦C. Use both
equations. Use both equations and compare the results

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