Question 25. H_2S and HS^- (K _al for H_2S is 8.9 times 10^-8) HCO^-_3 and C0^2-

Question

Question 25. H_2S and HS^- (K _al for H_2S is 8.9 times 10^-8) HCO^-_3 and C0^2- _3 (K_a2 for H_2CO_3 is 4.8 times 10^-11) HC_2O^- _4-and ( K_a2 for H_2C_2O_4 is 5.1 times 10^-5) Consider these five salts dissolved in water. Which aqueous solution will have an acidic pH? RbCN LiNO_3 NaBr NH_4CI.K_2CO_3 Which of these salts will have the largest molar solubility in water? AgcI (K_sp = 1.8 x 10_-10) Pbs (K _sp = 2.5 times 10^-27) SrCO_3 (K_sp = 9.3 times 10_-10) PbCrO_4 (K _sp = 1.8 times 10^-14) BaSO_4 (K _sp = 1.1 times 10^-10)

Explanation / Answer

25

molar solubility

from Ksp

Mx(N)y <--> xM+y + yN+x

Ksp = [M+y]^x[N+x]^y

then

in this specific case we have x = 1 and y = 1

so

Ksp = [A][B]

since [A] = [B] in solutoin

assume "S" as molar solubilty of the solid

then

Ksp = [S]^2

we need the smalles Ksp

choose answers 10^-10

then

1.1*10^-10 is the smallest value

so

S = ksp^0.5 = (1.1*10^-10)^0.5

S = 0.00001048808 M

choose BaSO4

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