5- What is the concentration of the Mg 2+ ion in solution when [CO 3 2- ] = 0.25

Question

5-

What is the concentration of the Mg2+ ion in solution when [CO32-] = 0.25 M given that the Ksp = 6.82*10^-6  for the following reaction:MgCO3 (s) ---Mg^2+(aq)+CO3^2-(aq)

Select one:

a. 5.2 x 10-2

b. 19.2

c. 2.7 x 10-5

d. 3.7 x 104

e. None of these

6-

the equilibrium expression for the reaction C(s) +2H2(g)-----CH4(g) is Keq = [CH4]/[C][H2]^2

Select one:

True

False

7-

Using the activity list included in this problem, which element/ion listed below is the most easily oxidized?
ACTIVITY SERIES = Sn(s)---Sn^2+(aq)+2e-

Pb(s)---Pb^2+(aq)+2e-

H2(g))---2H+(aq)+2e-

CU(s)---Cu^2+(aq)+2e-

Select one:

a. Cu+2

b. Sn+2

c. Pb

d. H2

e. None of these

Explanation / Answer

Ans 5

concentration of the Mg2+ ion =?

Concentration of [CO32-] = 0.25 M

Ksp = 6.82*10^-6

The balanced reaction

MgCO3 (s) ---Mg^2+(aq)+CO3^2-(aq)

Equilibrium constant expression of the reaction

Ksp = [Mg2+] [CO3(-2)]

6.82*10^-6 = [Mg2+] [0.25]

[Mg2+] = (6.82*10^-6) /(0.25) = 0.00002728

= 2.728 x 10^-5 M

Option C is the correct answer

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