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Rina8888 [55]
3 years ago
14

If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this?

Chemistry
1 answer:
cestrela7 [59]3 years ago
6 0

Natural Science. Although I don't know whether paleontology counts as a nautral science.

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The student placed 10 mL of PbCl2 (saturated solution) in the test tube and added a pinch of NaCl. A white precipitate of PbCl2
zysi [14]

Answer:

Adding NaCl to a saturated PbCl2 solution will decrease the Pb2+ concentration.

Explanation:

If a solution is saturated this means it cannot dissolve more material.  

PbCl2 ⇆ Pb2+ + 2Cl-

Adding more Cl- in the solution is the same thing as trying to dissolve more of the material. In the solution, the concentration of Cl- will increase.

In order for the Ksp to maintain a constant value, the concentration of Pb2+ must decrease if the concentration of Cl- is increased.

Adding NaCl to a saturated PbCl2 solution will decrease the Pb2+ concentration.

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Calculate the concentrations of iron(iii) ions and scn- ions when 5.00 ml of 0.002m iron(iii) nitrate is mixed with 4.00 ml of 0
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Volume of Fe(NO₃)₃ = 5.00 ml

Total voluem of the solution = 20.0 ml

Concentration of Fe(NO₃)₃ = 0.002 M

Assuming complete dissociation of  Fe(NO₃)₃ concentration of Fe³⁺  = 0.200 M

Using the dilution equation, M₁V₁ = M₂V₂

where M₁ and M₂ are the initial and final concentration of Fe³⁺  respectively and V₁ and V₂ are the initial and final volume of Fe³⁺  respectively

Plugging the data we get,

M₂ = \frac{0.002 M x 5.00 ml}{20.0 ml} = 5 x 10⁻⁴

Therefore, the concentration of Fe³⁺ once diluted in the mixture is 5 x 10⁻⁴M  


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