A 1.0 M Aqueous Solution Of Which Substance Would Have The Lowest PH?


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Babz Bell answered
This looks suspiciously like a homework question. Remember teachers are pretty web-savvy beasts as well now and can use Google as well as specialist software to detect crowd sourced answers. It also looks like you've missed the second part of the question out as a question structured like this will usually give you a couple answers with which to work with.
Essentially the pH scale, the scale in chemistry which measures the acidity or basicity (sometimes referred to as alkalinity) of an aqueous solution and bases its results on a negative logarithm (base 10) of the molar concentration of dissolved hydronium ions (H3O+) runs from zero to 14 where zero is extremely acidic, 14 is extremely alkaline and  pure water is for the most part neutral at seven.
Measurements outside of this scale are at times recorded but there is some debate over these findings as measuring such extremes is awfully difficult although the algorithm used for the scale can mean negative figures or measurements above 14 are theoretically possible.
In a common laboratory situation the aqueous solution with the lowest pH that will likely encounter is hydrochloric acid, a solution of hydrogen chloride (HCl) in water which will range from 0 to -1 depending on the concentration.
There is apparently a rather nasty substance that goes by the name of Fluoroantimonic acid (HSbF6) which is a mixture of hydrogen fluoride and antimony pentafluoride and can come in various ratios. The 1:1 combination forms the strongest known super-acid, that's how bad it is and can come in at incredible and highly corrosive -25pH. Fluoroantimonic acid is 2_1016 times stronger than 100 per cent sulphuric acid.

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