Lol, onions. Onions produce a chemical irritant called synpropanerhial-S-oxide.
Answer:
The value is 
Explanation:
Generally the reaction between oxygen and magnesium is

Generally from the law of mass conservation in a chemical reaction we have that

Here
is the mass of magnesium
is the mass of oxygen
is the mass of magnesium oxide
So

=> 
=> 
pH: 5.4E-3
pOH: 13.9946
[H+]: 0.987643022777
[OH-]: 1.01251158256E-14 acid
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