0.210 mole of Na2CO3 in 200.0 mL of solution
I don't see a question here.
To determine the concentration of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters).
In this case, we have 0.210 moles of Na2CO3 in 200.0 mL of solution. First, we need to convert the volume from milliliters to liters by dividing it by 1000:
200.0 mL ÷ 1000 = 0.200 L
Now we have the volume in liters. To find the concentration, we use the following formula:
Concentration (in moles per liter) = Amount of Solute (in moles) / Volume of Solution (in liters)
Concentration = 0.210 moles / 0.200 L
Concentration = 1.05 moles per liter (mol/L)
Therefore, the concentration of the Na2CO3 solution is 1.05 mol/L.