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0 | file:///C:/Users/ Blackboard Learn myCSUB Login ALEKS-Assessment YouTube. Super Ante e GoPhone At-home practice-conceptual Increasing solubility Which of these salts will increase in solubility when the solution is acidified with a little HNO3? AgCl, PbF2, CuCO3, Nis Which of these salts is more soluble in pure water than in a solution acidified with HCI? Fe (POa)2, Pb(OH)2, PbCl2, BaF2 A chemist has a mixture of solid AgBr, NaNO, and CuC,0, salts. How could the chemist separate each salt from the others? Lead compounds have been used as paint pigments, but because the leadlI) ion is toxic, the use of lead paints in homes is now prohibited. Which of the following lead(II) compounds wouldlyield the greatest number of lead(II) ions when added to the same quantity of water (assuming that some undissolved solid always remains): PbCrOs. PbSO, or PbS? Note this comparison can be done conceptually only because for all three compounds Ksp x2 Pbcro, K,,-1.8×1014, Pbso, K,,-1.7×10-8, PbSKp= 2.5x10-27

Explanation / Answer

Q1

HNO3 = H+ + NO3- present

AgCl + H+ --> no effect

PbF2 --> PB2 + +2F-; F- + H+ = HF, therefore, increases solubility

CuCO3 = Cu+2 + cO3-2

CO3-2+ H+ --> HCO3- , there is in crease in solubility

d)

NiS --> Ni+2+ + S-2

S-2 + H+ = HS-

then, ther eis increas in solubility

Q2

pure water than in HCl

Fe3(PO4)3 --> Fe+2 + PO4-3 if H+ present, this is much more soluble

Pb(OH)2 --> false, it is more soluble in acidic media

PBCl2 --> CL- ions will decrease solubility, so it is more soluble in water

BaF2 -- > Ba+2 + 2F- ; + H+ --> increases solubiltiy in acidic media

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