Question

25.3g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250ml of solution. If sodium carbonate dissociates completely , molar concentration of sodium ion , Na+ and carbonate ions are respectively?

Answer 1

Answer on Question #43192, Chemistry, Inorganic Chemistry

Question:

25.3g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250ml of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions are respectively?

Solution:

$$\mathrm{Na_2CO_3} \rightarrow 2\mathrm{Na^+} + \mathrm{CO_3^-}$$ $$\begin{aligned} n(\mathrm{Na_2CO_3}) &= n(\mathrm{CO_3^-}) = \mathrm{m/M} = 25.3 / 106 = 0.24 \text{ mole} \\ n(\mathrm{Na^+}) &= 2n(\mathrm{Na_2CO_3}) = 2 \times 0.24 = 0.48 \text{ mole} \\ C(\mathrm{CO_3^-}) &= n/V = 0.24 \text{ mole} / 0.25 \text{ L} = 0.96 \text{ mole/L} \\ C(\mathrm{Na^+}) &= n/V = 0.48 \text{ mole} / 0.25 \text{ L} = 1.92 \text{ mole/L} \end{aligned}$$

Answer:

1.92 mole/L and 0.96 mole/L of sodium ions and carbonate ions respectively.

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