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Question

0.25 moles of sodium chloride are dissolved in water to make a 500 mL solution. The molarity of the Cl ions is :

A
0.50 M
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B
0.25 M
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C
1.50 M
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D
2.00 M
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Solution

The correct option is A 0.50 M
We know,
Molarity=moles of NaCltotal volume of solution (mL)×1000=0.25500×1000=0.5 M

Again,
NaClNa++Cl
1 mole of NaCl dissociates to give 1 mole of Cl ions,
Thus, 0.25 moles NaCl gives 0.25 moles of Cl ions

Since number of moles of Cl is same as NaCl, thus molarity of Cl is also 0.5 M.

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