Question 2 of 5 Incorrect Map sapling learning Find the conditional formation co

Question

Question 2 of 5 Incorrect Map sapling learning Find the conditional formation constant for Ca(EDTA)2-at pH 1 1.00, where log Kr is 10.65 and 14-is 0.81. Number K,-113.645 x 10'0 Find the concentration of free Ca2+ in 0.045 M NadCa(EDTA)] at pH 11.00. M NagCalEDTAIl at p 11.00. Incorrect. You have correctly found the conditional formation constant for Ca(EDTA (K/ = 3.6 x 1010). To find the concentration Number [ca 2+-11 1.22 × 10 -6 M of Ca2, make an equilibrium table for the complex formation. 0.045 0.045-x Set the equilibrium expression equal to Kf, and solve for x.

Explanation / Answer

Solution :-

Equation

Ca^2+ + EDTA   ---------- > CaY^2-

0               0                             0.045

+x             +x                           -x

X             x                              0.045-x

Lets write the equilibrium constant equation

Kf= [CaY^2-]/[Ca^2+][EDTA]

Kf = [0.045-x] /[x][x]

3.6*10^10=[0.045-x]/[x]^2

3.6*10^10 *x^2 = 0.045-x

Solving for the x we fer

1.12*10^-6 =x

Threfore the concentration of the Ca^2+ = x = 1.12*10^-6 M

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