I purchased this from the internet
I have a container of pool and spa ph increaser which is 97% sodium carbonate but it has blue crystals scattered through it. Would the blue crystals alter the formula? All I can gather from the label is that the Blue crystals are minerals.
According to the CAS number (497-19-8) it is anhydrous.
I wouldn't really trust the blue crystals. I'd only use something that was fairly obviously entirely sodium carbonate - which I think most are (because it's the cheapest thing for them to do).
Of course, if you try the stuff and it seems to have no impact, then it'll probably be fine.
Bingo. Georg's got it.
Regarding the "dense" aspect of the name: For crystalline substances, this is generally an indication of physical form. A "dense" version typically has a coarser, sugar-like texture that has a higher bulk density, whereas a "light" version will typically have a finer, flour-like texture with a lower bulk density. Both versions are chemically identical and can be used interchangeably, with the caveat that the dense version may take a little longer to dissolve.
Another readily available and inexpensive source for sodium carbonate is the grocery store. Good old fashioned washing soda is sodium carbonate decahydrate. Look for it in the laundry section.
I have a container of pool and spa ph increaser which is 97% sodium carbonate but it has blue crystals scattered through it. Would the blue crystals alter the formula? All I can gather from the label is that the Blue crystals are minerals.
As for now I will put the blue crystal sodium carbonate on the shelf. I may experiment with it at a later date. If I do experiment with it I will post my results here. Thanks for all the information.
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