# Chapter 8 - Periodic Relationships Among the Elements - Questions & Problems: 8.119

#### Work Step by Step

We know that the solution of $Na_2SO_4$ is colorless which shows that $SO_4^-2$ is colorless and the blue color is because of $Cu^+2$.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.