What is the molarity of a solution for which 250 mL of the solution contains 10.0 g of Pb(NO3)2?
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What is the molarity of a solution for which 250 mL of the solution contains 10.0 g of Pb(NO3)2?
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Answer:
0.16 mol L-¹
Explanation:
The trick here is to realize that one formula unit of magnesium chloride,
MgCl
²
, contains one magnesium cation,
Mg
²+
, and two chloride anions,
Cl
−
.
Since magnesium chloride is a soluble ionic compound, this implies that every mole of the salt that dissolves in water will produce
1
mole of magnesium cations and
2
moles of chloride anions.
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