Subject: How do table salt and lemon juice (and tomato sauce) react?

I've noticed that when I have both lemon and salt on my food, that the 
tartness of the lemon juice is toned down a bit.  I've also noticed when I'm 
eating tomato sauce, that I have to keep reapplying salt in order to taste it 
well.  I'm wondering if these things noticed are due to a chemical reaction of 
some kind.  Thanks for your help!

Re: How do table salt and lemon juice (and tomato sauce) react?