How many moles of $N a^{+}$ ions are in 20 mL of 0.4 M $N a_{3} P O_{4}$ ?

0.008

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0.024

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0.05

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0.2

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Solution

The correct option is C 0.024
1 mol of Na $_{3} P O_{4}$ contain 3 moles of Na $^{+}$ ions
moles of Na $^{+}$ ions in given sample
= 3x 20x 10 $^{- 3}$ x0.4
=0.024

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