pH 7 being neutral only works at STP (lab temperature). Actually the dissociation constant K~w~ of water increases a lot across the normal range of seawater (0-30^o^C), so in tropical seas there's a lot more of both H^+^ and OH^-^ around. I'd imagine that molecules of early life could be stable at some temperatures - i.e. in some regions, while not in others.
this post was submitted on 12 Feb 2025
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