How to calculate pH of HCl?

1 Answer
anor277
Apr 29, 2018

Well, by definition, pH=−log10[H3O+]...we gets pH=−1

Explanation:

The conc. HCl we pour from a reagent bottle is typically 33% w/w...and has a density of 1.16⋅g⋅mL−1...these are data I pulled from the web...

And so we can address the molar concentration with these data....

Concentration=Moles of soluteVolume of solution...

And working from a 1⋅mL≡10−3⋅L volume we gots...

33%×1.16⋅g36.46⋅g⋅mol−11.00×10−3⋅L=10.5⋅mol⋅L−1

And, given that pH=−log10[H3O+]...here pH=−log10(10.5)=−1.02...

Normally, we would deal with much more dilute acid concentrations...and why should we add acid to water when we make these dilutions...

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