In which of the following solutions would solid PbCl_2 be expected to be the lea

Question

In which of the following solutions would solid PbCl_2 be expected to be the least soluble at 25 degree C? Briefly explain your choice Ca(OH)_2 is insoluble at pH > 12, but (s) becomes soluble at this pH. Which of the following reactions are consistent with this chemistry concept (amphoterism)? When combined, will 100 ml 5.0 times 10^-4 M CaCI_2 and 250 mL 2.7 times 10^-4 M K_2CO_3 result in a solid precipitate or not? The Ksp for Calcium Carbonate is 4.5 times 10^-4 (show calcs to support yes or no answer)

Explanation / Answer

Q18

PbCl2 is least soluble when there is plenty of common ions...

CACl2 --> Ca+2 and 2Cl- ions

this is the most Cl- ions, wich 0.1*2 = 0.2 M of Cl-2

therefore, this is the solution which is the LEAST solution

PbCl2(s) <--> Pb+2(aq) + 2Cl-(aq)

adding Cl- will favour the shift toward solids, therefore,decreases slubility

Q19

for Al(OH)3 solubiliy:

there must be formation of COMPLEX

Al(OH)3 + OH-(aq) --> Al(OH)-4

choose A

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