Calculating pH for Mg(OH)2 Precipitation 0.1M Mg2+

In summary, the question is asking for the pH at which Magnesium Hydroxide will begin to precipitate from a solution containing 0.1M Mg2+ ion with a Ksp of 10^-11. The solution involves adding base until precipitation occurs, and there is no other source of OH-. The conversation also includes a humorous misunderstanding of the question.
  • #1
zorro
1,384
0

Homework Statement



Caculate the pH at which Magnesium Hydroxide begins to precipitate
from a solution containing 0.1M Mg2+ ion? Ksp=10^-11

Homework Equations





The Attempt at a Solution



I did not understand why Ksp is given.
Since the concentration of Mg2+ is 0.1, concentration of OH- will be 0.2 (by stoichiometry).
Moreover there is no other source of OH-.
Where am I wrong?
 
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  • #2
You start with a solution that contains Mg2+ (from whatever source) and you add base till precipitation starts.

Your ability to understand questions in unintended way is incredible :smile:

--
 
  • #3
LOL. May be it is because I think too much behind a problem :wink:
 

Related to Calculating pH for Mg(OH)2 Precipitation 0.1M Mg2+

What is the formula for calculating pH for Mg(OH)2 precipitation?

The formula for calculating pH for Mg(OH)2 precipitation is pH = 14 + log(0.1/[Mg2+]), where [Mg2+] is the concentration of magnesium ions in the solution.

What is the significance of using 0.1M Mg2+ in the precipitation calculation?

0.1M Mg2+ is typically used in precipitation calculations because it is a commonly used concentration in laboratory experiments and is a suitable concentration for studying pH changes in a solution.

How does Mg(OH)2 precipitation affect the pH of a solution?

Mg(OH)2 precipitation is an alkaline reaction, meaning it increases the pH of a solution. This is because when Mg(OH)2 dissolves in water, it releases hydroxide ions (OH-) which react with water to form more hydroxide ions, increasing the alkalinity of the solution.

What factors can affect the accuracy of calculating pH for Mg(OH)2 precipitation?

Some factors that can affect the accuracy of calculating pH for Mg(OH)2 precipitation include: temperature, impurities in the solution, and the presence of other chemicals that may react with Mg(OH)2 or affect the pH of the solution.

What is the purpose of calculating pH for Mg(OH)2 precipitation in scientific research?

Calculating pH for Mg(OH)2 precipitation is important in scientific research as it allows us to understand and predict the effects of this reaction on the pH of a solution. This information can be used in various fields such as environmental science, chemistry, and material science.

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