Textbook G.23

[Rhiana_Cayanan_2F]

What is the best approach to finding the concentration of chloride ions in the solution? Do I add the grams of NaCl and KCl together and then do a molar mass ratio or? Thank you!

[Kaila Jung 2H]

Hi Rhiana! You would first find the molar mass of NaCl and KCl. Your next step would be to divide the grams given by the molar mass that you found to find the mols of each and then add those together to find the moles of solute. Then, you would divide by the liters of solution to get the Molar Concentration.

[205538966]

You have to find the moles of each molecule first then you divide the grams given by the molar mass of the molecule, which can be find by adding the atomic mass of each element present in the molecule. Then you divide the moles of each molecule by the amount of solution. Finally, you add both of the results to obtain the molarity of the chloride ions

[Lucas Vu 2G]

My approach to this question would be to convert the grams of each compound (NaCl and KCl) into the moles of each compound by dividing the given grams by the molar mass of each compound. With the moles of each compound, you then know the total moles of Cl ions by adding the moles of NaCl and KCl that you calculated. You can add these two mole values because, for every one mole of NaCl or KCl, there is one mole of Cl ion. With the moles of Cl ions and the given volume, you can calculate the concentration because concentration is equal to moles divided by volume (in liters).