Solid-liquid phase diagrams: Tin (Sn) and Lead (Pb) The following is a simplifie

Question

Solid-liquid phase diagrams: Tin (Sn) and Lead (Pb) The following is a simplified phase diagram for tin and lead. What would be present at points x, a, b and c? x: a molten mixture of tin and lead a: solid lead and a molten mixture of tin and lead b: solid tin and a molten mixture of tin and lead c: a solid mixture of tin and lead b) What name is given to the mixture of 62% Sn and 38% Pb? Answer: eutectic mixture c) What is the melting point of pure tin and pure lead? 232 degree C and 327 degree C respectively.

Explanation / Answer

from the phase diagram, 100% Pb refer to pure lead, the melting point is 327 deg.c. similalry for tin, it is 232.

Eutectic mixure is a homogeneous mixture of two metals. From the phase diagram, it refers to 62% Sn and 38% lead.

point a is solid lead and molten mixture. point b is solid tin and molten mixture. c is mixture of lead and tin. x is a molten mixture of lead and tin.

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