All Questions
7
questions
1
vote
2
answers
635
views
Why do increasing concentrations of zinc chloride not linearly decrease the freezing point?
I did an experiment on how different concentrations of $\ce{ZnCl2}$ affect the freezing point of demi water. My results were that till a concentration of about $10\ \mathrm{mol\,dm^{-3}}$ the freezing ...
- 19
2
votes
1
answer
2k
views
Why is lithium bromide used in absorption refrigerators?
Lithium bromide refrigerator
Why is lithium bromide used in absorption refrigerators? It is more expensive than sodium chloride. The wikipedia article on lithium bromide says it is extremely ...
- 3,848
1
vote
1
answer
24k
views
Is the dissolution of sodium acetate trihydate endothermic?
Sodium acetate trihydrate dissolves in water to its constituent ions:
$$\ce{NaOAc.3H2O (s) ->[H2O] Na+ (aq) + OAc- (aq) + 3H2O (l)}$$
The crystallisation of sodium acetate from a supersaturated ...
- 121
2
votes
2
answers
17k
views
Which formula is correct for calculating the heat of dissolution?
I want to calculate the energy change when a solute is dissolved in water. I know that I can achieve this by using the equation $q=mc \Delta T$. My question is does the mass ($m$) change with the ...
- 113
5
votes
1
answer
486
views
Thermodynamics behind Deliquescence?
The phenomenon of deliquescence wherein a water soluble substance absorbs water from atmosphere and dissolve in it forming a saturated solution, has thermodynamic roots. I have read the fact that the ...
- 6,795
7
votes
2
answers
13k
views
Azeotropes and separation by distillation?
I have just recently learnt the theory of fractional and normal distillations and the basics of maximum and minimum boiling azeotropes.
Most books say that the components of the mixture forming an ...
- 6,795
19
votes
1
answer
889
views
Deliquescence/efflorescence: How can I convert between salt concentration and RH?
I am looking at two phase diagrams, one has axes of $T$ and $\%\ce{MgClO4}$ in a $\ce{H2O-MgClO4}$ mix, and the other has axes of $T$ and relative humidity. The authors of the second phase diagram say ...
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