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chemistry

prepare a phosphate buffer with pH= 7 from solid NaH2PO4 (pKa =7.21) and Na2HPO4.

1) calculate the ratio of [CB]/[acid]
I got the ratio as 0.62

2) calculate the mass of each component required to make 1L of a .1 M buffer solution

3) if the pH is 7.10, how would you adjust it to 7.0?

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  1. 1. 0.62 is correct.
    2. base/acid = 0.62 or
    base = 0.62*acid (equation 1)
    You want 0.1M x 1 L = 0.1 mol and
    base + acid = 0.1 mol (equation 2)
    Solve the two equation simultaneously (in which base and acid will be in mols), then convert mols to grams of each.

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