Chemistry, 30.08.2019 03:00 apreston2882
You add 30ml of 1m of nh3 to a 50ml solution of 0,2 mgcl2. magnesium hydroxide (mg(oh)2) precipitates.
what is the minimum concentration of nh4+ that prevents the precipitation of mg(oh)2?
given information:
(mgoh2) ksp = 13
(nh3) kb = 10^-4.75
note: a complex formation between mg and nh4+ is ruled out.
Answers: 3
of 
= 13 and 
of 
= 
= 
![Mg(OH)_{2} \rightleftharpoons Mg^{2+} + 2[OH^{-}]](/tpl/images/0210/7309/b229d.png)
![K_{sp} = [Mg^{2+}][OH^{-}]^{2}](/tpl/images/0210/7309/b67d6.png)
![4 \times [OH^{-}]^{2}](/tpl/images/0210/7309/cb444.png)
![[OH^{-}]](/tpl/images/0210/7309/e46dd.png)
= 1.80276 M![K_{w} = [H_{3}O^{+}][OH^{-}]](/tpl/images/0210/7309/912a0.png)
 ......... (1)
![[OH^{-}] = \frac{K_{w}}{[H_{3}O^{+}]}](/tpl/images/0210/7309/47cf2.png)
= 
= 
![K_{a} = \frac{[H_{3}O^{+}[NH_{3}]]}{[NH^{+}_{4}]}](/tpl/images/0210/7309/251f5.png)
....... (2)![[NH^{+}_{4}]](/tpl/images/0210/7309/286e5.png)
as follows.![\frac{[H_{3}O^{+}][NH_{3}]}{K_{a}}](/tpl/images/0210/7309/e4886.png)
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You add 30ml of 1m of nh3 to a 50ml solution of 0,2 mgcl2. magnesium hydroxide (mg(oh)2) precipitate...
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