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Simora [160]
4 years ago
15

at standard pressure how do the boiling point and the freezing point of NaCl compare to the boiling point and freezing point of

H2O
Chemistry
1 answer:
Ede4ka [16]4 years ago
7 0
Usually in this context you would be referring to the boiling and freezing point of a NaCl <em>solution</em> (saltwater) compared to pure H_{2}O. Sematics would be different for NaCl compound itself, you would say melting and boiling point for a solid substance- and the temperatures would be very, very radical (high). 
The boiling point of pure water is 100 degrees C (212 F), and the freezing/melting point is below 0 degrees C (32 F). For a salt water solution, the boiling point is raised and the melting point is lowered. This means that water will stay liquid for an increased range of temperature. Depending on the amount of NaCl solute in the water, the boiling and melting points may change a few degrees.
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if Fe(NO3)3 is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion g
Ilya [14]

The given question is incomplete. the complete question is : If 5.15 gFe(NO_3)_3 is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion.

Answer:  The molar concentartion of nitrate ion is 0.195.

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Given : 5.15 g of Fe(NO_3)_3 is dissolved

Volume of solution = 323 ml

Molarity=\frac{n\times 1000}{V_s}

where,

n= moles of solute

Moles=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{5.15g}{242g/mol}=0.021moles  

V_s = volume of solution = 323 ml

Molarity=\frac{0.021\times 1000}{323}=0.065M

As 1 M of Fe(NO_3)_3 gives 3 M of NO_3^- ions.

Thus 0.065 M of Fe(NO_3)_3 gives  = \frac{3}{1}\times 0.065=0.195M of NO_3^- ions.

The molar concentartion of nitrate ion is 0.195.

4 0
3 years ago
What makes the atomic radius change down a column of the periodic table
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8 0
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iris [78.8K]
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Chlorine is under Group VII (Halogens), in which these elements can gain electrons easily.

The inner shell electrons on potassium will merge with the outer shell of electrons of chlorine to make potassium chloride.
6 0
4 years ago
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