Multiple choice What is pH of saliva in human beings? 8.0 - 10.0 7.5 - 8.0 7.5 - 9.0 6.7 - 6.9 Reveal answer Fill a bubble to check yourself D Correct answer Explanation Saliva of humans is slightly acidic so as to inhibit the action of harmful microbes. Its pH range is 6.7 - 6.9.