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Sedaia [141]
3 years ago
5

Which one of the following is not a compound?

Chemistry
1 answer:
sveta [45]3 years ago
5 0
1.no because table salt is a compound.
2.oxygen
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Lead(II) nitrate is added slowly to a solution that is 0.0800 M in Cl− ions. Calculate the concentration of Pb2+ ions (in mol /
barxatty [35]

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[Pb^{2+}]=3.9 \times 10^{-2}M

this is the concentration required to initiate precipitation

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Ip>Ksp

Precipitation starts only when solution is supersaturated because solution become supersaturated then it does not stay in this form and precipitation starts itself only solution become saturated.

This usually happens when two solutions containing separate sources of cation and anion are mixed together and here also we are mixing lead (||)nitrate solution(source of lead(||)) into the Cl- solution.

Ip=[Pb^{2}][2Cl^-]^2=Ksp

Ksp=2.4\times 10^{-4}

lets solubility=S

[Pb^{2+}] = S

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Ksp=[Pb^{2+}]\times [Cl^-]^2

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Ksp=4S^3

S=\sqrt[3]{\frac{Ksp}{4} }

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[Pb^{2+}]=3.9 \times 10^{-2}M this is the concentration required to initiate precipitation

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