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Puttaneska , (edited )

They told me at school that ‘p’ meant ‘negative log’. So ‘pH’ means ‘the negative log of the concentration of Hydrogen ions in moles/litre’.

pH 1 is 1 x 10^-1^ (strong acid)

pH 7 is 1 x 10^-7^ (neutral)

pH 14 is 1 x 10^-14^ (alkaline)

(Chemistry was a long time ago, though)

Speculater , (edited )
@Speculater@lemmy.world avatar

The xkcd breaks it down for us, basically we don't know because the person who coined the term never specified what it was. It's either: puissance, potens, or potenz. Which means potency in French, Dutch Danish and German, the three languages the scientists published in.

Dagwood222 ,

I was taught it meant 'potential' but that was 6th Grade in the US, so I guess it was all a lie.

Bumblefumble ,

Dutch and Danish are not the same language. So yeah, the Danish scientist published in Danish, not Dutch.

Speculater ,
@Speculater@lemmy.world avatar

Oh shit, my bad lol.

nodiet ,

Can the term potency also be used to refer to the exponent in English? Because that is what is meant by the terms in the other languages and I haven't come across that usage of the word potency in English

Speculater ,
@Speculater@lemmy.world avatar

I think that's accurate, the exponent is what it's referring to, but the pedantic types are worried about what the p literally means.

Puttaneska ,

Thank you. I think the decades-old chemistry-class flashback distracted me from thoroughly absorbing the full post!

Wizard_Pope ,
@Wizard_Pope@lemmy.world avatar

You're missing a 4 in the alkaline line

Puttaneska ,

Thank you (4 now added!)

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