Question

ANALYTICAL CHEMISTRY - PLEASE I NEED HELP ASAP!

(Use significant figures and scientific notation)

Part A An aqueous weak acid HA with a pK $_a$ =4.00 is created at 0.10 M. What is the percent ionization of this acid to the nearest tenth of a percent?

Part B A buffer was made by mixing 10mL of 0.40M sodium dihydrogen phosphate (NaH $_2$ PO $_4$ ) with 10mL of 0.40 M sodium hydrogen phosphate (Na $_2$ HPO $_4$ ). What is the pH after 20.0mL of 0.010M NaOH is added to the buffer? The 3 K $_a$ values for phosphotic acid are: K $_{a1}$ = 7.5x10 $^{-3}$ , K $_{a2}$ = 6.2x10 $^{-8}$ ,K $_{a3}$ = 4.8x10 $^{-13}$ .

Part C Consider the weak acid H2​A, with Ka1=1.00x10^{-4} and Ka2=1.00x10^{-8}. Write all equations associated with this weak acid's equilibrium. (Hint-there are 5).

Answer 1