You may check this manual for phosphate buffer preparation.
Sengar, R. S., Choudhary, R. 2014. Laboratory manual of Biochemistry method and techniques. New India publishing agency, New Delhi
normally, good biochemistry lab manuals provide those things in appendices. Do check it, if you cant get it, let me know, i'll send you an image of that page. OK.
As student you learn to calculate with the acidity constant. When you actually start to work in the lab you might learn the easy way. When you need the P-buffer at 0.2M, simply make 0.2M KH2PO4 and 0.2M K2HPO4 (or the Na salts) and mix the 2 solutions until you have the desired pH. You can make the P-buffer at a high molarity as stock solution and dilute this if you need lower molarities.
please refer to phosphate buffer table http://www.uslims.uthscsa.edu/po4buffers.php
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