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Lady bird [3.3K]
3 years ago
12

The student placed 10 mL of PbCl2 (saturated solution) in the test tube and added a pinch of NaCl. A white precipitate of PbCl2

formed. How will this affect the concentration of Pb+2?
Chemistry
2 answers:
konstantin123 [22]3 years ago
8 0

Answer:

Concentration of Pb^{2+} decreases

Explanation:

In a saturated solution of PbCl_{2}, the following solubility equilibrium exist-

                         PbCl_{2}\rightleftharpoons Pb^{2+}+2Cl^{-}

Now, NaCl contains common ion Cl^{-}. Therefore, concentration of Cl^{-} increases in solution.

But, at a particular temperature, equilibrium constant remain constant. Therefore to keep equilibrium constant same Pb^{2+} will reacts with excess Cl^{-} to decrease concentration of Cl^{-}.

Therefore concentration of Pb^{2+} decreases.

Note: Equilibrium constant for the above equilibrium=\left [ Pb^{2+} \right ]\left [ Cl^{-} \right ]^{2}

NNADVOKAT [17]3 years ago
5 0
PbCl₂(aq) → Pb²⁺(aq) + 2Cl⁻(aq)

NaCl(aq) → Na⁺(aq) + Cl⁻(aq)

Pb²⁺(aq) + 2Cl⁻(aq) ⇄ PbCl₂(s) 

At increase the concentration of chloride ions - concentration of lead ions decreases, the lead chloride is formed. 

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3 years ago
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What is the mass of 8.0 x 10^26 UF6 molecules?
gulaghasi [49]
First, find the number of moles of UF6
Avagadro's number = 6.023 x 10^23

Number of moles = 8.0 x 10^26 / Avagadro's number = 8.0 x 10^26 / 6.023 x 10^23 = 1.328 x 10³ moles

Molecular weight of UF6 = Molecular weight of U (238.02891) + Molecular weight of F6 (6 x 18.9984032) = 238.02891 + 113.9904192 = 352.0193292 g/mol

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3 0
2 years ago
Which of these pairs indicates an incorrect coupling of reversible reactions?dehydration synthesis and hydrolysisanabolic and ca
Olegator [25]

Answer:

option C= hydrolysis and break down

Explanation:

All other three pairs are correct coupling of each others.

Option A= dehydration synthesis and hydrolysis

Dehydration synthesis:

In dehydration synthesis monomers combine through the covalent bonds and form large molecules. The large molecules are called polymers. The water as a byproduct also released when monomers joints together.

Hydrolysis:

In hydrolysis the polymers are break down into monomers by using water molecules. The catalysts are also required in this process.

Option B= Catabolic and Anabolic

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In this process smaller molecules combine to gather to form large complex molecules by using energy.

For example simple glucose molecules join together to form large disaccharides.

Catabolic:

It is the break down of large complex molecules to the smaller molecules.

For example during cellular respiration sugar molecules break down and generate energy.

Option D=  Break down and synthesis

The break down and synthesis are also reverse pair of each others. The  synthesis involve the formation of molecules form smaller component while the break down involve destruction of molecules into smaller units.

8 0
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Will mark as Brainliest.
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D i took the test Enjoy :))))
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