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Consider a 100 ml buffer with pH 2.4 prepared by mixing sodium hydrogen phosphate with 1.5 M HCl . Concentration of H ₂ PO ₄⁻ in buffer is 0.6 M . How much HCl (in ml ) should be added in sodium hydrogen phosphate solution? Pka ₁=2.1, Pka ₂=7.2, 2=0.3

Correct answer

20.00

Step-by-step solution

aligned & pH = pk _ a + [ H ₂ PO ₄⁻ ] [ H ₃ PO ₄ ] & 2.4=2.1+ 0.60 [ H ₃ PO ₄ ] & [ H ₃ PO ₄ ]=0.3 M aligned 30 m.moles of HCl =20 ml of 1.5 M HCl

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