Calculate the mass concentrated in gdm3 of the ion Cl- in 0.2M dm3 sodium chloride solution.?
0.2 M dm3 is not correct. You must mean 0.2 M which means 0.2 mol/dm3.
And you must want g/dm3.
grams Cl^- = mols Cl^- x atomic mass Cl^- = 0.2 x appox 35.5 = ?
To calculate the mass concentration of an ion in a solution, you need to know the molar mass of the ion and the molarity of the solution.
For this question, the ion is Cl- (chloride ion) and the solution is a 0.2 M (moles per liter) sodium chloride (NaCl) solution.
1. Find the molar mass of Cl-:
- The molar mass of Cl is 35.45 g/mol (atomic mass).
- Note that Cl- has a charge of -1, indicating that it has gained an electron.
2. Calculate the mass of Cl- in the solution:
- The molarity of the solution is 0.2 M, which means there are 0.2 moles of NaCl per liter.
- Since NaCl is a 1:1 ionic compound, there are also 0.2 moles of Cl- ions per liter of the solution.
- To calculate the mass, multiply the moles of Cl- by its molar mass:
Mass of Cl- = moles of Cl- × molar mass of Cl-
= 0.2 moles × 35.45 g/mol
= 7.09 g
3. Finally, convert the mass to grams per cubic decimeter (g/dm^3):
- Since there are 0.2 moles of Cl- ions in 1 dm^3, the mass concentration can be calculated by dividing the mass (7.09 g) by the volume (1 dm^3):
Mass concentration = mass of Cl- / volume of solution
= 7.09 g / 1 dm^3
= 7.09 g/dm^3
Therefore, the mass concentration of Cl- in the 0.2 M sodium chloride solution is 7.09 g/dm^3.