Answer : The concentration of sodium ion is, 4.5 mole/L
Solution : Given,
Concentration of sodium carbonate = 3 mole/L
Concentration of sodium bicarbonate = 1 mole/L
Volume of sodium carbonate = 70 ml = 0.07 L (1 L = 1000 ml)
Volume of sodium carbonate = 30 ml = 0.03 L
First we have to calculate the moles of sodium carbonate and sodium bicarbonate.
As we know that there are 2 sodium ion present in sodium carbonate and 1 sodium ion in sodium bicarbonate. Thus, the total moles of sodium ion will be,
Now we have to calculate the concentration of sodium ion.
Total volume = 0.07 + 0.03 = 1 L
Therefore, the concentration of sodium ion is, 4.5 mole/L