NaH2PO4 (1M) and Na2HPO4 (1M)
a. Calculate the pH. (show all the work)
b. Write the balance equilibrium.
a)
Henderson - Hasselbalch equation which give pH of a buffer solution is
pH = pKa + log([A-]/[HA])
where,
A- = conjucate base, HPO42-
HA = weak acid , H2PO4-
pKa of H2PO4- = 7.21
pH = 7.21 + log( 1M/1M)
pH = 7.21 + 0
pH = 7.21
b)
H2PO4- (aq) + H2O(l) <--------> HPO42-(aq) + H3O+(aq)
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