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How would you prepare a .100 L of 50mM succinate buffer at pH 3.85 using solid...

How would you prepare a .100 L of 50mM succinate buffer at pH 3.85 using solid disodium suddinate, DI water and either 1.00 M NaOH or 1.00 M HCL. The formula weight of disodium succiante is 162 g/mol. pka1 = 4.21; pka2 = 5.64.

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Answer #1

Let , and represents succinic acid, monosodium succinic acid and disodium succinic acid respectively.

0.100 L of 50mM succinate buffer corresponds to

Let x moles of NaHA and 0.005-x moles of H2A are present.

Thus 0.00152 moles of NaHA and moles of H2A are present.

0.00348 moles of H2A are obtained when 0.00348 moles of Na2A react with moles of HCl.

0.00152 moles of NaHA are obtained when 0.00152 moles of Na2A react with 0.00152 moles of HCl.

Total number of moles of Na2A required

The formula weight of disodium succiante is 162 g/mol.

Mass of disodium succinate

Total number of moles of HCl required

The volume of 1.00 M HCl required

The volume of 1.00 M HCl required

0.81 g of disodium succinate is dissolved in sufficient amount of water, 8.5 mL of 1.00 M HCl is added slowly and the mixture is shaken. Then it is diluted to mark in 100 ml standard volumetric flask.

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