In 20K gallons, each 1/2 gallon of 6% bleach will raise chlorine by 1.5 ppm. In the same amount of water, each 4 oz of baking soda used should raise your TA by 1 ppm. Can't be that exact for pH though--the higher the alk level in the pool, the more borax or acid it will take to raise or lower the pH. The lower the alk level, the less of each chem it will take to move the pH.

Edit: Anna, your Post button is working faster than mine tonight!