Question

You are given a salt that could be NaH2PO4 or Na2HPO4.
a. Explain how you can use the Ka of the conjugate bases to differentiate the two salts.

Answer 1

Answer A)
NaH2PO4
Na2HPO4

H2PO4HPO42-

+
+

Na+
2Na+

As dissociation continues value of Ka of conjugate base decrease.

Thus a salt with higher Ka value will be NaH2PO4 and salt with lower Ka value would be
Na2HPO4.
http://www.coursehero.com/tutors-problems/Chemistry/8548075-You-are-given-a-salt-that-could-be-NaH2PO4-or-Na2HPO4-a-Explain-h/

Answer 2

wow thanks!

Answer 3

you'r welcome :)