mgoh2s is insoluble in gl at ph 860. to calculate the solubility of mgoh2s, you will need to use the molar mass of mgoh2s (58.3 g/mol) and the molarity of the solution (0.1 mol/L).
MgOH2S + H2O ? Mg(OH)2 + HS-
The solubility of Mg(OH)2 is 0.14 g/L at 25°C and 0.12 g/L at 50°C. The solubility of HS- is 0.023 g/L at 25°C and 0.018 g/L at 50°C.
Introduction
In general, the solubility of a given solute in a given solvent decreases as the temperature of the solvent increases. For example, the solubility of NaCl in water is 36 grams per 100 milliliters of water at 0 degrees Celsius (32 degrees Fahrenheit), but only 26 grams per 100 milliliters of water at 100 degrees Celsius (212 degrees Fahrenheit). The reason for this decrease in solubility with increasing temperature is that, as the temperature of the solvent increases, the molecules of the solvent move faster and are more effective at “shielding” the ions of the solute from each other, thereby reducing their attraction to each other and their tendency to form a solid crystal.
What is solubility?
Solubility is the property of a solid, liquid or gaseous chemical substance called solute to dissolve in a solid, liquid or gaseous solvent. The solubility of a substance fundamentally depends on the physical and chemical properties of the solute and solvent as well as on temperature, pressure and the pH of the solution. The extent of the solubility of a substance in a specific solvent is measured as the maximum amount of that substance that can dissolve in that solvent under specified conditions.
Factors affecting solubility
Several factors can influence the solubility of a substance in a given solvent. In general, solubility increases with temperature, since hot liquids are able to hold more dissolved solids than cold liquids. Additionally, some substances are more soluble in polar solvents than in non-polar solvents, while others are the opposite. The nature of the interactions between the particles of the solid and the molecules of the solvent also play a role in determining solubility. For example, ionic compounds generally dissolve better in water than in other liquids because water molecules are able to hydrogen bond to the ions.
The solubility of magnesium hydroxide in water
Magnesium hydroxide is a white solid that is insoluble in water.
The solubility of magnesium hydroxide in glacial acetic acid
At a given temperature, the solubility of a salt in a solvent is the maximum amount of that salt that can be dissolved in that solvent. The solubility of magnesium hydroxide in glacial acetic acid (a polar solvent) at various temperatures and at a fixed pH of 8.60 is shown in the table below.
| Temperature | Solubility (mg/100 mL) |
|---|---|
| 0 °C | 14.0 |
| 10 °C | 15.8 |
| 20 °C | 17.9 |
| 30 °C | 20.2 |
| 40 °C The solubility of magnesium hydroxide in aqueous solutions buffered at pH 8 | |
| Magnesium hydroxide is slightly soluble in water, with a solubility of 10-4 M. The solubility of magnesium hydroxide decreases as the pH of the solution decreases. Magnesium hydroxide is more soluble in acidic solutions than in basic solutions. Conclusion |
Mg(OH)2 is less soluble in glacial acetic acid than in water. The addition of a buffer does not significantly change the solubility of Mg(OH)2 in glacial acetic acid.
References
-http://www.sciencelab.com/msds.php?msdsId=9927682
-https://pubchem.ncbi.nlm.nih.gov/compound/Magnesium_hydroxide#section=Top
-https://en.wikipedia.org/wiki/Magnesium_hydroxide