Question

2)_ To prepare a buffer solution with a pH of 3.45 What should be the mass of Sodium mandelate that should be added to 500ml of 1.00M mandelic acid solution?
Use the H-H equation. You will need to look pKa for mandelic aci
pH = pKa + log [(base)/(acid)] or pKa + log (b)/(a)
3.45 = pKa + log (b)/(1)
Solve for (b) in millimoles/mL = M. You've solved for M and you have mL (100 mL) so you solve for millimoles. Convert to mols and remember mol = grams/molar mass. You have molar mass and mols, calculate grams and you have it.

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