Quick Soil Test Without a Kit Want to know if your soil is acidic or alkaline? Here’s a simple test using just vinegar and baking soda: Place 1 tbsp of soil into two separate containers Dampen each with a bit of clean water Add vinegar to one. If it fizzes, your soil is alkaline Add baking soda to the other. If it fizzes, your soil is acidic No reaction? Your soil is likely neutral If your soil is acidic, Calcium Hydroxide can help neutralize it. It also works for water glassing eggs, emergency