Question

98. A solution of 0.075 M CoBr$_2$ is saturated with H$_2$S ([H$_2$S] = 0.10 M). What is the minimum pH at which CoS begins to precipitate? CoS(s) $\rightleftharpoons$ Co$^{2+}$(aq) + S$^{2-}$(aq) $K_{sp}$ = 2.3 × 10$^{-27}$ H$_2$S(aq) + 2H$_2$O(l) $\rightleftharpoons$ 2H$_3$O$^{+}$(aq) + S$^{2-}$(aq) K = 8.9 × 10$^{-27}$

Name: 98 a solution of 0075 m cobr2 is saturated with h2s h2s 010 m what is the minimum ph at which cos begins to precipitate coss rightleftharpoons co2aq s2 aq ksp 23 10 27 h2saq 2h2ol righ 42804
Uploaded: 2020-04-10T10:34:31-08:00
Duration: 3 min 42 s
Channel: Aadit Sharma
Description: 98 a solution of 0075 m cobr2 is saturated with h2s h2s 010 m what is the minimum ph at which cos begins to precipitate coss rightleftharpoons co2aq s2 aq ksp 23 10 27 h2saq 2h2ol righ 42804

          98. A solution of 0.075 M CoBr$_2$ is saturated with H$_2$S ([H$_2$S] = 0.10 M). What is the minimum pH at which CoS begins to precipitate?
CoS(s) $\rightleftharpoons$ Co$^{2+}$(aq) + S$^{2-}$(aq)
$K_{sp}$ = 2.3 × 10$^{-27}$
H$_2$S(aq) + 2H$_2$O(l) $\rightleftharpoons$ 2H$_3$O$^{+}$(aq) + S$^{2-}$(aq)
K = 8.9 × 10$^{-27}$

98 a solution of 0075 m cobr2 is saturated with h2s h2s 010 m what is the minimum ph at which cos begins to precipitate coss rightleftharpoons co2aq s2 aq ksp 23 10 27 h2saq 2h2ol righ 42804

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Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Aadit Sharma

04/10/2020

Step 1

3 \times 10^{-27}$ Since the solution is 0.075 M CoBr$_2$, the concentration of Co$^{2+}$ is 0.075 M. We can calculate the minimum concentration of S$^{2-}$ required for precipitation to begin: $[S^{2-}] = \frac{K_{sp}}{[Co^{2+}]} = \frac{2.3 \times Show more…

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98. A solution of 0.075 M CoBr$_2$ is saturated with H$_2$S ([H$_2$S] = 0.10 M). What is the minimum pH at which CoS begins to precipitate? CoS(s) $\rightleftharpoons$ Co$^{2+}$(aq) + S$^{2-}$(aq) $K_{sp}$ = 2.3 × 10$^{-27}$ H$_2$S(aq) + 2H$_2$O(l) $\rightleftharpoons$ 2H$_3$O$^{+}$(aq) + S$^{2-}$(aq) K = 8.9 × 10$^{-27}$