1. Using the H2O-NaCl phase diagram,
(a) What is the minimum temperature below which spreading salt on ice will be ineffective?
(b) What concentration of salt is necessary to have a 25% ice- 75% liquid brine at –10 oC?
2. (a) Pure lead melts at 327oC and pure tin melts at 232o C, yet when we make an alloy of lead- 61.9 wt% Sn it melts at a much lower temperature of 183 oC, explain.