What is the correct K_sp expression for PbBr_2? K_sp = [Pb^2+][Br_2^2] K_sp = [P

Question

What is the correct K_sp expression for PbBr_2? K_sp = [Pb^2+][Br_2^2] K_sp = [Pb^2+][Br]^2 K_sp = [2Pb^2+][Br^-] K_sp = [Pb^2+]^2[Br^-] In whivch of the following solutions would the solubility of calcium carbonate be the smallest? Pure water 0.1 M calcium chloride 0.5 M sodium chloride 0 1 M calcium chloride 0.2 M sodium carbonate How many of the following processes would you expect to be spontaneous 298 K and 1 atm? Dissolving sugar in water Decomposing NaCl to the elements Climbing a mountain H_2O(l) rightarrow H_2(g) + O_2(g) 0 2 1 3

Explanation / Answer

13

PbBr2 <--> Pb+2 + 2Br-

then...

Ksp = [Pb+2][Br-]^2

14.

CaCO3

avoid Ca+2 and CO3-3

then

avoid the 0.2 Na2CO3 since it has higher concentration

15.

spontanous . dissolveing sugar in water

NaCl wont be sotnaneous

climign a monains is not spontanous

H2O decomposigin is not spontanous

then

only dissolving water

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