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How to prepare buffer?

Question asked by Wai Fun Leong on Mar 15, 2019
Latest reply on Mar 16, 2019 by Steven Cooke

On a student lab practical manual for extraction of plant pigments,  under the reagent line it says: Prepare citrate-phosphate-borate-HLC buffer, pH 2,3,5, and 7. How to prepare this/these buffer(s)?