You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

iphreeqc-py
0.1a5

This version was deleted from PyPI around 2023-10-18. Installing fails with:
$ pip3 install iphreeqc-py==0.1a5 ERROR: Could not find a version that satisfies the requirement iphreeqc-py==0.1a5
View other deleted versions of iphreeqc-py

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-10-17/ \ iphreeqc-py==0.1a5
Sign up for StableBuild to get an API key (it's free and takes <60 seconds!)

Or, download files manually

And install manually via pip:
iphreeqc_py-0.1a5-py3-none-any.whl (88.6KB)
iphreeqc-py-0.1a5.tar.gz (67.4KB)