why does milk show as a base on red litmus paper and an acid on wri paper?

Subject: why does milk show as a base on red litmus paper and an acid on wri paper?

Date: Thu Mar 19 15:31:30 1998
Posted by juanell brown
Grade level: 4-6
School: golden valley middle school
City: san bernardino State/Province: california
Country: usa
Area of science: Chemistry
ID: 890343090.Ch

Message:


the pH of milk is 6.5, but the red litmus paper turns blue.  how can a 
substance be both an acid and a base?  is milk a weak acid or a weak 
base?

Re: why does milk show as a base on red litmus paper and an acid on wri paper?

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