25.3 ~g of sodium carbonate, Na ₂ CO ₃ is dissolved in enough water to make 250 ~mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na ⁺ and carbonate ion, CO ₃²⁻ are respectively (Molar mass of Na ₂ CO ₃=106 ~g ~mol ⁻¹ )

Step-by-step solution

aligned Molarity & = number of moles of solute volume of solution (in mL) 1000 & = 25.3 1000 106 250 =0.9547 0.955 M aligned Na ₂ CO ₃ in aqueous solution remains dissociated as Since, the molarity of Na ₂ CO ₃ is 0.955 M , the molarity of CO ₃²⁻ is also 0.955 M and that of Na ⁺ is 2 0.955=1.910 M