Question

Can Ba2+ be separated from Pb2+ by the addition of Na2SO4? Assume the starting solution is 0.10 M in both cations and use whatever concentration of sulfate you like. (Ksp of PbSO4 = 1.3 x 10-8), while that of( BaSO4 = 1.5 x 10-9). Calculate how much of the first cation to precipitate is left in solution when the second starts to fall out of solution. Is it less than 1% of the initial present?

Answer #1

Since both are 0.1 M to start with as per the individual Ksp
Ba^{2+} must precipitate out first since its Ksp is
lower

Ksp = [Ba^{2+}][SO_{4}^{2-}]

1.5 x 10^{-9} = 0.1 x [SO_{4}^{2-}]

[SO_{4}^{2-}] = 1.5 x 10^{-9}/0.1

[SO_{4}^{2-}] = 1.5 x 10^{-8} M

so when 1.5 x 10^{-8} M SO_{4}^{2-} is
added Ba^{2+} starts to precipitate out

For Pb^{2+} to precipitate out the calculation will
be

Ksp = [Pb^{2+}][SO_{4}^{2-}]

1.3 x 10^{-8} = 0.1 x [SO_{4}^{2-}]

[SO_{4}^{2-}] = 1.3 x 10^{-8}/0.1

[SO_{4}^{2-}] = 1.3 x 10^{-7} M

so when 1.3 x 10^{-7} M SO_{4}^{2-} is
added Pb^{2+} starts to precipitate out

At this concentration the amount of Ba^{2+} in solution
is

1.5 x 10^{-9} = [Ba^{2+}] x 1.3 x
10^{-7}

[Ba^{2+}] = 1.5 x 10^{-9}/1.3 x
10^{-7}

[Ba^{2+}] = 0.0115 M

So the Ba^{2+} in solution is 0.0115 M when
Pb^{2+} starts to precipitate out, this is about 11.5% of
the original.

**It is not less than 1% of the initial.**

The cations
Pb2+(aq) and Ba2+(aq) can be precipitated as
almost insoluble sulfates. The Ksp values for
PbSO4(s) and BaSO4(s) are 2.5 × 10−8 and 1.1
× 10−10, respectively.
If you have a solution
that is 0.010 mol L-1 in both Pb2+(aq) and
Ba2+(aq) ions, and the concentration of
SO42-(aq) ions is gradually increased, the
less soluble salt will precipitate first.
What is the
concentration of the cation (Pb2+ or Ba2+)
that precipitates first remains in solution just before the second...

A 1.00 L solution at 25˚C containing both 0.0020 M
Ba2+ and 0.0020 M Pb2+.
A solution containing dissolved SO42– is
slowly added to the solution containing 0.0020 M Ba2+
and 0.0020 M Pb2+.
a) Which salt will precipitate first, BaSO4 or
PbSO4? Briefly explain your answer.
b) Calculate the concentration of SO42–
that must be added to create a saturated solution with 0.0020 M
Pb2+. (Ignore Ba2+.)
c) T or F The Ksp value of PbSO4 will
increase as...

Ba2+ is added to a solution to precipitate sulfate as BaSO4 (Ksp
= 1.1 x 10-10). a. The concentration of [Ba2+] is raised to 0.0020
M and solid BaSO4 is present in the system; calculate the
equilibrium concentration of SO42-. b. Suppose KCl is added to the
system to increase the ionic strength to 0.100 M; calculate the
activity of the Ba2+ in this solution. c. Is equilibrium [SO42-]
increased, decreased or unchanged by the addition of KCl ?

An aqueous solution of barium nitrate is added dropwise to a
solution containing 0.10 M sulfate ions and 0.10 M fluoride ions.
The Ksp value for barium sulfate = 1.1 x 10-10 and the Ksp value
for barium fluoride = 1.7 x 10-6
a.) Which salt will precipitate from solution first?
b.) What is the minimum [Ba2+] concentration necessary to
precipitate the first salt? c.) What is the minimum [Ba2+]
concentration necessary to precipitate the second salt?
c.) What is...

The cations Hg2 2+, Ag+, and Pb2+ can be precipitated as
insoluble chlorides: Hg2Cl2 (Ksp=1.2x10^-18), AgCl
(Ksp=1.8x10^-10), PbCl2 (Ksp=1.7x10^-5). If you have a solution
containing these three cations, each with a concentration of 0.10
Mol/L, what is the order in which they precipitate as
hydroxides?

A solution contains 7.61×10-3 M
sodium chromate and
1.37×10-2 M sodium
chloride.
Solid silver nitrate is added slowly to this
mixture.
What is the concentration of chloride ion when chromate ion
begins to precipitate?
[chloride] = --------------M
Table of Solubility Product Constants (Ksp at 25
oC)
Type
Formula
Ksp
Bromides
PbBr2
6.3 × 10-6
AgBr
3.3 × 10-13
Carbonates
BaCO3
8.1 × 10-9
CaCO3
3.8 × 10-9
CoCO3
8.0 × 10-13
CuCO3
2.5 × 10-10
FeCO3
3.5 × 10-11
PbCO3...

a)How is it possible to determine if CaCO3 is Cl- free after
synthesis?
b)How can the Cl- ions be remove from CaCO3 after synthesis?
I should answer the questions from the following experiment but
if you know the answer and you are sure, yo do not need to read
experiment.
Please answer correctly because i hav no chance to make wrong
:((((
Physical and Chemical Properties of Pure Substances
Objective
The aim of today’s experiment is to learn handling chemicals...

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