sour mash and yeast

just made a 1 gal sour. I know the ph is below 4.8 but how low it is exactly, I'm not sure. question is can you use 05 yeast in low ph beer?

Yeast are fine in an acidic environment. Normal primary fermentation will be about 4.2 and the acidity helps the yeast process maltose. Post fermentation, beer will rise to 4.6 or so.

Yeast will be fine down to pH of 3, which is about the same as lime juice. It might take a little longer to kick off, due to the pH inhibiting older, weaker cells. A healthy starter volume will overcome that issue.