ai Answer the following questions about each of these four ions: Co2+, TI, Pr3+,
ID: 552750 • Letter: A
Question
ai Answer the following questions about each of these four ions: Co2+, TI, Pr3+, and C. (a) Is its bromide soluble or insoluble? (b) Is its selenide soluble, insoluble, or hydrolyzed? (c) In which group of the qualitative analysis scheme (1, II, III as sulfide, Ill as hydroxide, IV, or V) does this metal ion occur? (d) Is this metal more likely a ithophile or a chalcophile? (e) Which is the more likely mineral source: a silicate or a sulfide? (f) Which is the more likely mineral source: an arsenate or an arsenide?Explanation / Answer
(a) Co+2 - Bromide is soluble ; Tl+ - Bromide is islightly soluble ; Pr3+- bromide is soluble
Cd+2- soluble
(b) All its selenides are insoluble
(c) Co+2 & Pr+3- belongs to group III ; Tl+ & Cd+2 - belong to group II
(d) According to Goldscmidt classification,
Co+2 is neither lithophile nor chalcophile ; Tl+ is chalcophile ; Pr+3 is lithophile
Cd+2 is chalcophile
(e) Co+2 - present in silicate form ; Tl+- sulfide ; Pr+3- free form ; Cd+2 - sulfide
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