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uysha [10]
3 years ago
7

Make a drawing of the particles in an NaCl solution to show why this solution conducts electricity. Make a drawing of the partic

les in an NaCl crystal to show why pure salt does not conduct.

Chemistry
1 answer:
cluponka [151]3 years ago
5 0

Answer:

  • See the image attached. It is taken from an online chemistry textbook.

  • See the explanation below.

Explanation:

<em>Sodium chloride</em> consits of sodium cations (positive ions), Na⁺, and chloride anions (negative ions), CL⁻.

<u>Pure sodium chloride</u> is packed in crystals: sodium ions and chloride ions are packed together and the ions are in fixed positions. There are not free electrons that can move. Thus, sodium chloride doesn't conduct electricity, because there are no electrons or ions which are free to move.

In aqueous solution, sodium chloride units dissociates into their ions:

         NaCl\rightarrow Na^++Cl^-

Those ions are freely to move in the solution, and such they are charge carriers, which conduct the electricity.

As explained above, in solid sodium chloride, the ions cannot move and there is not flow of current.

That is why solid pure salt of NaCl does not conduct electricity and the solutions of NaCl do conduct electricity.

The image attached show both diagrams. In the diagram A, the ions are packed together, showing that they cannot move. In the diagram B, the ions are dissolved in water, showing that they can move and carry the charge, allowing the flow of current.

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Q: A
according to this formula, we can get the mole fraction of water (n):
P(solu) = n Pv(water)
when we have Pv(solu) = 22.8 and Pv(water) = 23.8 so by substitution:
22.8 = n * 23.8
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- we need to get the moles of glucose:
moles of water = 500 g(mass weight) / 18 (molar weight)= 27.7 mol
n = moles of water / ( moles of water + moles of glucose)
0.958   = 27.7 / ( 27.7+ moles of glucose)
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Q: B
here we also need to get n (mole fraction of water )by using this formula:
Pv(solu) = n Pv(water)
when we have Pv(solu)=132 & Pv(water)=150 so, by substition:
132= n * 150
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∴ the molar mass of the solute = mass weight of solute / no.of moles of solute
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Q: C

moles of urea (NH2)2 CO = mass weight / molar mass
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moles fraction of methanol = moles of methanol / (moles of methanol + moles of urea )
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Pv(solu) = n P°v
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Hello,

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Best regards.

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