Comparing the Properties of CsF and NaF: Melting Point and Solubility

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In summary, the conversation discusses the difference between the properties of NaF and CsF, specifically their solubility and melting point. It is noted that the smaller radius of NaF accounts for its higher boiling point and that the CsF bond is weaker than the NaF bond due to its lower melting point and higher solubility. It is also mentioned that the length of bonding and crystalization system play a role in solubility.
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m0286
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Hello, I am doing a grade 12 chemistry course, through independent learning and I am stuck on a question... its probably simple and my mind just doesn't want to work.. so hopefully someone could help me out.

I am given the info that NaF has a solubility of 0.042 kg/kg H20 at 25 C and a melting point of 988 C.
And that CsF has a solubility of 3.67 kg/kg H20 at 25 C and a melting point of 682 C.
So what would be the difference between the properties of CsF and NaF?
 
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  • #2
NaF having a smaller radius could account for its higher boiling point. If an atom has a smaller radius, that means the elements are closer together, so more heat is needed to separate them.
 
  • #3
Did u check whether the crystalization system is the same...?As for solubility,it has to do both with the length of the bonding and with the system of crystalization.

Danie.
 
  • #4
Because CsF has a lower melting point and higher solubility than NaF, it means that the CsF bond is weaker than the NaF bond. This makes sense since the bond length for NaF is longer than CsF.
 

Related to Comparing the Properties of CsF and NaF: Melting Point and Solubility

1. What are the chemical formulas for CsF and NaF?

CsF stands for cesium fluoride, with a chemical formula of CsF. NaF stands for sodium fluoride, with a chemical formula of NaF.

2. What are the melting and boiling points of CsF and NaF?

The melting point of CsF is 682 °C (1,260 °F) and its boiling point is 1,390 °C (2,530 °F). The melting point of NaF is 993 °C (1,819 °F) and its boiling point is 1,700 °C (3,090 °F).

3. What are the physical properties of CsF and NaF?

CsF is a white crystalline solid with a density of 4.115 g/cm3, while NaF is also a white crystalline solid with a density of 2.558 g/cm3. Both compounds are soluble in water and have a bitter taste.

4. How do the properties of CsF and NaF compare?

Both CsF and NaF are ionic compounds, with CsF having a higher melting and boiling point than NaF. CsF also has a higher density and is more soluble in water compared to NaF.

5. What are the common uses of CsF and NaF?

CsF is commonly used in organic chemistry reactions as a fluorinating agent. It is also used in the production of optical glass and in nuclear reactors. NaF is used in toothpaste and other dental products for its anti-cavity properties. It is also used in the production of aluminum and as a flux in welding.

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