In: Chemistry
Suppose a biochemist decided to use a HEPES buffer system to purify her His-tagged protein. HEPES is a sulfonic acid with a relevant pKa of 7.5. What volume of 1M NaOH would she need to add to a 250mL solution of 20mM HEPES to raise the pH from 7.5 to 8.0 (remember the HEPES is a weak acid).