A saturated solution of magnesium hydroxide (commonly called milk of magnesium)

Question

A saturated solution of magnesium hydroxide (commonly called milk of magnesium) is prepared and the excess solid magnesium hydroxide is allowed to settle. A 25.0ml aliquot of the saturated solution is withdrawn and transferred to an Erlenmeyer flask, and two drops of methyl orange indicator are added. A 0.00053M HCl solution (titrant) is dispensed from a buret into the solution (analyte). The solution turns from yellow to a very faint red-orange after the addition of 13.2ml. a. How many moles of hydroxide ion are neutralized in the analysis? b. What is the molar concentration of the hydroxide ion in the saturated solution? c. What is the molar solubility of magnesium hydroxide? d. What is the solubility product, Ksp for magnesium hydroxide? Express the Ksp with the correct number of significant figures.

Explanation / Answer

A) (13.2 mL)(1 L/1000 mL)(0.00053 mol/L) = 6.996E-6 = 7.0E-6 with significan figures. B) M1V1 = M2V2; (0.00053M)(13.2mL) = M2(38.2mL); M2 = 1.8E-4M

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