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pH+ is nothing more than sodium carbonate, also known as soda ash. You can buy containers of it from any pool store, or online from Amazon.http://amazon.com/Clorox-Pool-Spa-19004CLX-4-Pound/dp/B00PZZF9YM/ref=sr_1_1?rps=1&ie=UTF8&qid=1464969421&sr=8-1&keywords=pH%2B&refinements=p_85%3A2470955011
Why are you talking about "Thermite"?
Hydrogen gas has an explosive range of 4% to 75% by volume of the air in the room, collectively known as "Lower Explosive or Flammable Limit" (LEL/LFL), and "Upper Explosive or Flammable Limit" (UEL/UFL). There has to be enough hydrogen to burn, thus the lower limit, but there also has to be enough oxygen, thus the upper limit. Below 4% there is not enough hydrogen, above 75% there is not enough oxygen.By the way, the same is true for all flammable gases and liquids. In the case of liquids, there is a minimum temperature which the liquid must attain to produce enough flammable vapor to burn. It is called the "Flash Point" (not the TV series). It is the vapor produced by the liquid that burns, not the liquid itself. Liquids with flash points below 100 degrees Fahrenheit are designated flammable.
Go to a pool store, or order online, a product called pH+, it is sodium carbonate, also known as soda ash.
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