Milk of magnesia is an aqueous suspension of magnesium hydroxide [Mg(OH)2] used to treat acid indigestion. Calculate the volume of a 0.035 M HCl solution (a typical acid concentration in an upset stomach) needed to react with two spoonfuls (approximately 10mL) of milk of magnesia [at 0.080 g Mg(OH)2/mL].
Answer:
You've got 10 mL of suspension.
That means you've got 0.80 g of magnesium hydroxide.
The molecular weight is 58.3 g/mol
0.80 g / (58.3 g/mol) = 0.0137 mol Mg(OH)2
Mg(OH)2 + 2 HCl = MgCl2 + 2 H2O (balanced!)
So you need 2 x 0.0137 mol of HCl = 0.0274 mol HCl.
Your solution has 0.035 mol per liter, so
0.0274 mol HCl / (0.035 mol/L) = 0.784 L = 784 mL.
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