Unit 3 4, if we are to minimize the total number of chloride ions impacting the environment upon ap- plication of road salt in the winter, which would be better to use on the roadss. a 23 w/w% sodium chloride solution or a 23 w/w% calcium chloride solution? show calculations to explain your choice! trying

It would be better to use the NaCl solution.

Explanation:

We can calculate the amount of Cl⁻ in each salt.

NaCl

Taking into account the molar masses, there are 35.5 g of Cl⁻ every 58.5g of NaCl. So, for a 23 w/w% solution of NaCl:

CaCl₂

Taking into account the molar masses, there are 71.0 g of Cl⁻ every 111g of CaCl₂. So, for a 23 w/w% solution of CaCl₂:

The concentration of Cl⁻ in the NaCl solution is 14.0 w/w% and its concentration in the CaCl₂ solution is 14.7 w/w%, so we would choose the NaCl solution to minimize Cl⁻ concentration.