Question

Which of the following will be more soluble in an acidic solution than in pure water? (it can be any of the 5)

a. Zn(OH)₂

b.SrSo₄

c.PbBr₄

d. CsClO₄

e. AlPO₄

Answer 1

A) will form basic solution (OH- ions increase pH)

B) SO4-2 will form very slighlty HSO4- but the pH change will be so little, don0t choose it, evne though that by definition you will have a little bit basic pH

C) 4Br- ions will not form HBr since this is a strong acid. Pb+2 will react with OH- ions of the solution to form Pb(OH)2(s) therefore, ions of OH- decrease, H+ ions are high, pH is acidic

D) Will not form equilibria... pH will remain near 7

e) AlPO4 ----> Al+3 and PO4-... This one is tricky

Al+3 will form Al(OH) increasing H+ ions, but PO4- will steal those H+3 ions, and actually is stornger so pH will be slightly basic