SOME LINKS ON acidity and basicity:
Some point about acids and bases:
http://www.fisicanet.com.ar / quimica/equilibrio_quimico/ap02_acidez.php
Simulation reactions between acids and bases:
http://www.iesaguilarycano.com/dpto/fyq/pH1.html
pH of some substances in everyday use:
http://www.educaplus.org / index.php? option = com_content & task = view & id = 88 & Itemid = 33
