This is done by measuring the pH, and gradually adding acids or bases to the solution.
Directions Measure the current pH of the solution.
The pH meter , if recently calibrated, may be used by simply rinsing the electrode in the distilled water, and then placing it in your solution. Be sure the control knob is on pH and the temperature knob is set to room temperature. Remember to rinse the electrode, return it to its protective vial, and turn the meter off when done. If the pH is too low , your solution is too acidic. Add a base such as NaOH solution .