< p >记住你关心< em > < / em >稳定字段。稳定的线路图是两种矿物质平衡的地方。一个一边一个矿物将更稳定,另一方面另一个。< / p > < p >让我们谈谈$ \ ce {Ca} $。都有相同的反应\ ce {Ca}这是美元活动并不是他们的相对稳定的一个因素。如果你写任何矿物的结合反应,它会消掉。试一试。方解石稳定性无关\ ce}{毫克或美元\ ce {SO4}是稳定美元只会依赖\ ce{二氧化碳}和$美元\ ce {Ca} $。但等待,你知道美元\ mathrm {ln} \,现代{\ ce{二氧化碳}}所以你可以计算美元\ mathrm {ln} \,现代\ ce与方解石{Ca} $处于平衡状态。所以你可以用它来帮助找出方解石是最稳定的。< / p > < p >你只有一个方程,包括硫酸。哪个方向,稳定边界会在你的图吗? Say you want to divide your diagram space into areas of calcite vs gypsum stability, how could you combine the two solubility equations to come up with the conversion of one mineral to the other? What dissolved species activities enter into the equation (hint: you know one of the two). Given that you can figure out the other one and plot that on you diagram. Can you follow a similar process for calcite and dolomite (hint: yes)? What about calcite and huntite? Is there any part of the diagram where huntite is more stable than dolomite (or vice versa)?
Now figure out the stability relationship between dolomite and gypsum. What angle will the line take on your plot? Figure out where it will occur by combining reactions. This is a bit trickier but the $\mathrm{ln}\,a$ values will depend on the $\mathrm{ln}\,K$ for the combined reaction.
Now erase any lines in a field where those two minerals are less stable than anything else.
Good luck and let us know if you get stuck. I didn't want to just give you the answer because I'd have to actually work it out.