How many grams of Na2CO3 should be mixed with 50.00g of NaHCO3 to produce 2000mL of buffer with pH=10?

Answer 1

Use the Henderson-Hasselbalch equation.
Na2CO3 is the base
NaHCO3 is the acid.
You want to use pK2.

Answer 2

How do i calculate the pKa??

Answer 3

pKa2 = -log(Ka2)