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seraphim [82]
3 years ago
8

Describe how to write the Ksp.

Chemistry
2 answers:
adoni [48]3 years ago
6 0

b2+ + 2 NO3- + 2 Na+ + 2 I- >> PbI2 (s) + 2 Na+ + 2 NO3-  


net ionic

Pb2+ + 2 I- >> PbI2  


Ksp = [Pb2+] [I-]^2  


Ksp = 7.1 x 10^-9  


molar solubility

let x = mol/L of Pb2+ that dissolve . This will give x mol/L Pb2+ and 2x mol/L I-  


7.1 x 10^-9 = (x) (2x)^2 = 4x^3  


molar solubility = 0.0012 M

~~thanks to google research~~

ira [324]3 years ago
4 0
Answer:

Well, for a start Ksp=Ksolubility product, and we use an equilibrium expression. 

Explanation:

For the sparingly soluble salt, MX, we write the equation that represents its dissolution:

MX(s)H2O⇌M++X−

Ksp=[M+][X−][MX(s)], but MX(s) as A SOLID cannot express a concentration, and thus the expression simplifies to...

Ksp=[M+][X−]

Usually standard conditions are specified, because a hot solution can generally hold more solute than a cold one.

For salts of the form MX2, Ksp=[M2+][X−]2. Ksp
have been measured for a host of insoluble, and semi-soluble ionic salts.

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WARRIOR [948]
Answer: the electrons remain around the atomic nuclei due to the existence of a positive charge on the nuclei that, of course, atract the negative charged electrons. The protons are the paricles in the nuclei that hold the positive charge.

Justification:

First, I wish to explaing the sense of the question. The question arises because given that the electrons have negative electric charge how is that they do not repeal each other to the point that they end leaving the nucleous of the atom alone.

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8 0
3 years ago
Answer number 1 please
kkurt [141]

Answer:

C. is the answer simple.

6 0
2 years ago
If the empirical formula of a compound is C2H5 and the Molecular mass is 87g/mol what is the molecular formula?
frez [133]
C6H15, C2H5 has a molar mass of 29g/mol. 87 divided by 29 is 3. Then multiply each element subscript by 3
6 0
3 years ago
A sodium ion, Na+, with a charge of 1.6×10−19C and a chloride ion, Cl− , with charge of −1.6×10−19C, are separated by a distance
sasho [114]

Answer:

W\geq 2.1x10^{-19}J

Explanation:

Due to Coulomb´s law electric force can be described by the formula F=K\frac{q_{1}.q_{2}}{r^{2}}, where K is the Coulomb´s constant (9x10^{9} N\frac{m^{2} }{C^{2} }), q_{1}= Charge 1 (Na+ in this case), q_{2} is the charge 2 (Cl-) and r is the distance between both charges.

Work made by a force is W=F.d and total work produced is the change in energy between final and initial state. this is W=W_{f} -W_{i}.

so we have W=W_{f} -W_{i} =(K\frac{q_{(Na+)}q_{(Cl-)}rf}{r_{f} ^{2}})-(K\frac{q_{(Na+)}q_{(Cl-)}ri}{r_{i} ^{2}})=Kq_{(Na+)}q_{(Cl-)[\frac{1}{{r_{f}}} -\frac{1}{{r_{i}}}]

Given that ri= 1.1nm= 1.1x10^{-9}m and rf= infinite distance

W=(9x10^{9})(1.6x10^{-19})(-1.6x10^{-19})[\frac{1}{\alpha }-\frac{1}{(1.1x10^{-9})}]=2.1x10^{-19}J

6 0
3 years ago
You are throwing a pizza party for 15 people and figure that each person will eat 4 slices. You call the pizza place and learn t
ANEK [815]

Answer:

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You need 5 pizzas. $14.78 x 5 = 73.90.

Explanation:

the answer is that one 73.90 is rounded nearest cent : ) took me a while to get it

8 0
3 years ago
Read 2 more answers
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