Why do metal ions appear in Pyrex glass?

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Metal ions are present in Pyrex glass to enhance specific properties such as thermal expansion, chemical resistance, and the temperature at which the glass softens. The composition of Pyrex, which includes oxygen, silicon, calcium, and sodium, was determined through experimentation to achieve these necessary characteristics. While the exact role of each individual metal ion is complex and not easily isolated, their presence contributes to the overall performance of the glass. The discussion highlights a desire for clarity on how different ions impact these properties. Understanding the interplay of metal ions in glass composition is crucial for optimizing its functionality.
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Metal ions in Pyrex--why?

According to http://en.wikipedia.org/wiki/Pyrex#Composition" is composed of oxygen, silicon, calcium, and sodium.

I've Google Scholared to no avail...

Thanks!
 
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What purpose does the carbon serve in hemoglobin?

I would say - none. Glass composition was experimentally determined so that it has needed properties. Metal ions were not added for a "purpose".
 


Glass composition was experimentally determined so that it has needed properties.

From that statement, I would conclude that without the metal ions, glass does not have certain needed properties, and with metal ions, it does. My question is: what are those needed properties that are effected by the various ions?
 


Needed properties are temperature at which glass becomes soft, coefficient of thermal expansion, chemical resistance and so on. But I strongly doubt it is possible to assign single property to a single ion.
 


I hear that. But I really want to know! (Ah, if only that made a difference...)
 

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