CHEM 112 Lecture Notes - Lecture 28: Aluminium Hydroxide, Lewis Acids And Bases, Silver Bromide
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12 Apr 2016
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Chem112 lecture 28 calculating with k and concentration. In which of these cases will a precipitate form, if the reaction is pbso4 pb2+ + 2- and the ksp = 1. 6 x 10-8: a. [pb2+] = 1. 25 x 10-4 and [so4: b. [pb2+] = 1. 25 x 10-4 and [so4: c. [pb2+] = 1. 25 x 10-5 and [so4, d. [pb2+] = 1. 25 x 10-4 and [so4. 2-] = 1. 25 x 10-4: the answer is a, because the q you calculate will be greater than the given ksp. Solubility questions: exam quality question: if 25 ml of 0. 010 m naoh is added to 75ml of 0. 10 m. Mgcl2 will mg(oh)2 precipitate: write the reaction, mg(oh)2(s) mg2+ + 2oh, ksp = 1. 5 x 10-11, q = [mg2+][oh-]2, 0. 025 . = 0. 0075 [!!: now you can plug these concentration values into your q equation, q = (0. 075)(0. 0029)2 = 4. 69 x 10-7, since q > k, the precipitate will form.
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