A 0.21-mol sample of a diprotic acid, H 2A, is dissolved in 250 mL of water. The K a1 of this acid is 1.0 × 10 –5 and K a2 is 1.0 × 10 –10. Calculate the concentration of A 2– in this solution. a.
0.84 M
b.
1.0 × 10–5 M
c.
1.4 × 10–3 M
d.
1.0 × 10–10 M
e.
2.9 × 10–3 M

Given the data below for the reaction, 2 a + 2 b + 4 c => d + e + 3 f, the reaction is fill in the [ ] order in a, fill in the [ ] order in b, fill in the [ ] order in c and fill in the [ ] order overall. (use the words "first, second, third, fourth" to fill each blank)experimentinitial conc of a, mol/l initial conc of b, mol/l initial conc of c, mol/l initial rate, mol/l.s1 0.1 0.1 0.2 2 x 10-32 0.2 0.3 0.2 6 x 10-33 0.3 0.1 0.2 2 x 10-34 0.4 0.3 0.4 1.2 x 10-2