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Question

Find the number of Na⁺ &PO^-3₄ ions kind 250 ml of 0.2 M Na3PO4 solution.

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Solution

We know,
MV =moles (where M is mass and V is volume)

For Na molecules,

(250/1000)(0.2)(3) =0.15 [multiplying by 3 because there are 3 ions of Na]

For phosphate ion,

(250/1000)(0.2) = 0.05

Now to convert it into no of ions multiply both the answers by avogadro's number

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