Question

2 g table salt is added to 0.5 m^3 water whose salt concentration is 10 mg/L. Compute the salt concentration of the mixture in ppm.

Please verify my solution:

Table Salt: 2g -> 2000 mg
Water Volume: 0.5 m^3 -> 500 L

C = 2000 mg / 500 L = 4 mg/L = 4 ppm

Answer 1

What did you do with the 10 mg/L that was there initially?