If the soil with the baking soda bubbles, the soil is acidic, since baking soda is alkaline with a pH of 8.2. 3 Add vinegar to your soil if you need to lower the pH or make the soil more acidic. Mix 1 gallon of water with 1 cup of vinegar. Pour the soluti

Baking soda is effective in raising pH levels of the soil. In case you want to try the other alternatives for increasing the levels, then you can also opt for limestone. Also here is a little tip if you want to decrease the pH level then replace baking so

Add distilled water to each and stir. Add 1 tbsp. of vinegar to the first and 1 tbsp. of baking soda to the other. If the cup with vinegar added starts to fizz and bubble, the soil is alkaline, since vinegar is acidic with a pH of 3.3. If the soil with th