Question

Given the pH = 7.000, [buffer] = 0.0200 M, [NaCl] = 0.0600 M and Vol = 0.100 L - calculate the [acid], [base], [NaCl] and equivalent weights of acid, base and salt.

You will be preparing a phosphate buffer with a desired pH of 7.00. The relevant reaction and equilibrium expressions are as follows: K-6.34 x 10-=[ro,'lu.] or mo HPO,- H,PO H,PO To make a phosphate buffer, you will use the following salts of the acid and conjugate base: NaH2PO4 H2O Na2HPO4 7H2O NaCl MW = 137.992 ± 0.001 g/mol MW- 268.066 0.001 g/mol Mw-58.4428 ± 0.0001 g/mol Note that these salts dissociate completely to give the acid H2PO, and the conjugate base HP0,2 rom point forward, we will use the following shorthand notation to refer to these species: gate base HPO. From this ATHPO- acid base

Answer 1

-Total Volume = 0.1 Li Con(enhatima Ncl冫 0.06 choose Halo Biná it hof pka of 'F-46 Hoc/ C1-7-46) 01 o d HnqJ 느0.346구 1.3467 Hoc) 0.0) 1-34 61? [cd] = o.oosly

5 TnO 77.9 mg Hdo mo) KM 0038 26 9 0.06 X o- 0.006 oli. ot 3S-28