Suppose there is an unsaturated solution of Na_2SO_4. How many phases and compon

Question

Suppose there is an unsaturated solution of Na_2SO_4. How many phases and components are present. What is the variance (the number of degrees of freedom) of the system? Identify the independent variables. Sketch the phase diagram of the system NaCl/ice given that the two substances do not form a compound with each other, that ice freezes (melts) at 0 degree C and NaCl freezes (melts) at 801 degree C, and that a eutectic is formed when the fraction of NaCl is 23% and that the eutectic melts at -21 degree C. Explain why salt can be used in winter to treat snowed roads.

Explanation / Answer

a. Na2SO4 have 2 components and 3 phases

2 components are Na2SO4 and water

3 phases are solid,liquid,vapour

b. varience is

F=C+2-P

here C=2(COMPONENTS)

P=3(PHASES)

F=2+2-3

F=1

NUMBER OF DEGREES OF FREEDOM = 1

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