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12 August, 00:54

Many soft drinks contain phosphate buffers. Calculate the ph of an 8 oz soft drink containing 4.4g of sodium dihydrogen phosphate (120g/mole) and 5.4 g of sodium hydrogen phosphate (142g/mol2

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  1. 12 August, 00:55
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    H2PO4- = 4.4g x 1mol/120 = 0.037mol 0.037mol/

    0.24L = 0.15

    HPO4-2 = 5.4g x 1mol/142g =

    0.038mol 0.038mol/0.24L =

    0.16pH = pKa + log

    ([HPO4-2] / [H2PO4-]) pKa = 7.2

    pH = pKa + log (0.16 / 0.15)

    pH = 7.2
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