策划一个矿物稳定图-地球科学堆栈交换江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 10 - t12:47:07z //www.hoelymoley.com/feeds/question/6652 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/6652 6 策划一个矿物稳定性图 墨丘利- 197 //www.hoelymoley.com/users/4479 2015 - 10 - 04 - t13:08:38z 2015 - 10 - 25 - t15:21:20z < p >我想找出如何阴谋的稳定性4矿物- $ \ ce{碳酸钙}$,$ \ ce {CaSO4} $, $ \ ce {CaMg(二氧化碳)2},美元和美元\ ce {CaMg3(二氧化碳)4}——用斧子\美元mathrm {ln} \,现代{\ ce {Mg ^{+ 2}}} $和$ \ mathrm {ln} \,现代{\ ce {SO_4 ^ {2}}} $, $ \ mathrm {ln} \,美元是每个离子的活动的自然对数的物种。碳酸盐岩是一个给定的活动。< / p > < p >我发现溶解度K美元对于每个解散,根据吉布斯自由能,R,美元和美元25 T = ^ \保监会\ mathrm {C} $,然后试图建立方程绘制如下:< / p > < ol > <李> $ \ mathrm {ln} \, K_ {\ ce {\ sp,碳酸钙}}= \ mathrm {ln} \,现代{\ ce {Ca}} + \ mathrm {ln} \,现代{\ ce {CO_3}} < /李> <李> \美元mathrm {ln} \, K_ {\ ce {\ sp, CaSO4}} = \ mathrm {ln} \,现代{\ ce {Ca}} + \ mathrm {ln} \,现代{\ ce {SO_4}} < /李> <李> \美元mathrm {ln} \, K_ {\ ce {\ sp, CaMg (CO_3) _2}} = \ mathrm {ln} \,现代{\ ce {Ca}} + \ mathrm {ln} \,现代{\ ce {Mg}} + 2 \ \ mathrm {ln} \,现代{\ ce {CO_3}} < /李> <李> \美元mathrm {ln} \, K_ {\ ce {\ sp, CaMg_3 (CO_3) _4}} = \ mathrm {ln} \,现代{\ ce {Ca}} + 3 \ \ mathrm {ln} \,现代{\ ce {Mg}} + 4 \ \ mathrm {ln} \,现代{\ ce {CO_3}} $ < /李> < / ol > < p >根据热数据每美元\ mathrm {ln} \, K美元是一个常数(从$ T $, $ p $是常数),由于碳酸盐岩的活动似乎我应该能够解决方程1钙的活动,但每一个方程都是不行。< / p > < p >我困惑如何每个方程依赖\ ce {SO_4},美元(这应该是y轴),以及如何与一切。我试图将活动\ ce {Ca}美元作为变量,然后求出它的活动\ ce {SO_4}美元,然后方程3,4依赖\ ce {SO_4},美元\ ce {Mg}美元,但我不知道如何对待方程1和2。还我得到的值非常大,线在$ y = 35 + 3 x和y = 18 + x美元美元。< / p > < p >这个问题是基于一个教科书上的问题,我想用它来研究为即将到来的考试(1周),所以任何帮助将不胜感激。< / p > //www.hoelymoley.com/questions/6652/-/6672 # 6672 6 答案由haresfur策划一个矿物稳定性图 haresfur //www.hoelymoley.com/users/1242 2015 - 10 - 09 - t04:23:35z 2015 - 10 - 25 - t05:48:25z < 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.

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