2. Suppose we have the following reaction: H2CO3 <> H+ (aq) + HCO3- (aq) with a
hypothetical equilibrium constant of 4.2 x 10-7. Calculate the concentration of each of
the three species involved in the equilibrium reaction. Assume you initially have 0.1M
of carbonic acid,

Ithink the answer is b.

Um i that even math

1.   an exact solution requires a radical solution - no decimal approximation.2. (a)4x^3 = 756x^3 = 756/4 = 189x =   cube root of 189 =   5.74   to nearest hundredth answer(b)   189 = 3*3*3*7   so we can write the cube root of 189 as 3∛7 answerchecking (a) 4*(5.74^3 =   756.48   which is very close(b)   4* ((3∛3)^3   = 4*189   = 756   - spot on! 3. i would use solution b because the original question asked for an exact solution.