If the soil was left wide open and outside, and you're grow is inside, I'd pick up a new bag of soil to use on the indoor plants. You'll probably have some critters that have moved in and could cause you some problems somewhere down the road. If nothing else, it might be a good idea to bake the soil in the oven to kill off any eggs that are left to hatch.

As for pH, you'll want to get a test kit to measure that. The pH in soil can vary wildly, so any predictions/guesses about it are likely to be wrong - unless you've been growing for a while and know each ingredient you use in the soil mix. Get your hands on a digital pH pen if you can afford it, and if not, then those cheap little liquid test kits will give you a general idea of what you're dealing with. Test your watering source, then test the runoff water from the bottom of the pots, and you'll know what your pH is.

Take care. :jointsmile: