Mix up some 7 PH water and run it through your dry soil. Catch the first run off. It should be 6.5 to 6.8. If your soil is "hot" I assume you mean it has too much fertilizer in it. In that case you flush your plants with PH 6.8 water. Do it over and over as much as you can stand, let the soil dry out as much as possible, then start feeding at about 1/4 strength and work your way up to full, or one step below whatever caused the hot soil. There are also cheap soil PH test kits, but I've never used them. People tell me the soil run off test is more accurate.

Never heard of baking your soil.