A buffer solution containing equal concentration of the two sodium phosphate Salts has a pH of 7.2 calculate the pH of a pharmaceutical preparation containing .002 Mol per decimeter cube of Na2Hpo4 and .005Molper decimeter cube ofNaH2PO 4
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Explanation:
from Henderson equation of acidic buffer solution we know,
pH = pKa +log [A-]/[salt]
degree of ionization (∞) = √Kc/C = 3.4e-3
So, [CH3COO-] = C∞ = 3.4e-3 × 1.5 = 5.2e-3
So, pH = 4.7 + log [5.2e-3]/0.2 = 4.7 + log 0.026 = 4.7 - 1.58 = 3.115
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