1. The term for a solution with a low pH number, such as lemon juice or vinegar, is . 2. The for a solution that has an equal concentration of H and OH- is . 3. The term for a solution with a high pH number, such as ammonia or bleach, is . 4. An acid is a compound that donates to a solution. 5. The higher the pH number, the higher the concentration of in a solution. 6. A substance that accepts H when they are in excess and donates H when their concentration drops is called a(n) .