Question

3 g of sodium carbonate na2co3 is dissolved

Answer 1

Number of moles of   = 25.3 x ( 1 / 105.96 ) = 0.238 mol

Now, to find number of mol  of  in given solution,

 = No. of moles of   / volume in Litres

 = 0.238 / 0.25 = 0.952 mol /L (To convert 250 ml to L we divide by 1000 as 1000 ml = 1 L)

2) Finding the number of ions :

   

   → 2   + 

So we get 2 moles of sodium and 1 mole of carbonate in 1 mol of solution of sodium Carbonate

3) Finding molarity : 

Molarity of sodium ion is = No. of moles of Sodium ion x  = 2 x 0.952 = 1.904 moles of  / Litre = 1.904 M

Molarity of Carbonate ion is = No. of moles of Carbonate ion x  = 1 x 0.952 = 0.952 moles of Carbonate ion / Litre = 0.952 M

 molar concentration Of sodium ion and carbonate ion are 1.904 M & 0.952 M respectively

Answer 2

In what? 3 GRAMS OF SODIUM CARBONATE IS DISSOLVED IN WHAT?! FOR GOD'S SAKE FINISH THE ANSWER!