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My school textbook makes the following claim:
This means that saliva must be basic. However, I learnt that the pH value of saliva is about 6.8, which would surely make it acidic. How can the above point be correct then?
Saliva is neutral, not acidic (6.8 is very barely acidic), and is a means to carry the acid away physically, and is also much less acidic than acid produced by bacteria, so is still effective in neutralizing.