There is just the single horizontal part of the graph where everything is freezing. ![]() This particular mixture of lead and tin has a cooling curve which looks exactly like that of a pure substance rather than a mixture. That continues until you have added enough tin that the mixture contains 62% tin and 38% lead. you will still get the graph going horizontal (showing the freezing of both the tin and lead) at exactly the same temperature: 183☌.Īs you increase the proportion of tin, the first signs of solid lead appear at lower and lower temperatures, but the final freezing of the whole mixture still happens at 183☌. That's where the graph would suddenly become less steep. For a mixture containing only 20% of tin, the freezing point of the lead is about 275☌. The less tin there is, the smaller the drop in the freezing point of the lead. ![]() ![]() If you had less tin in the mixture, the overall shape of the curve stays much the same, but the point at which the lead first starts to freeze changes.
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