Final answer:
The formula for the hypothetical polyatomic ion Paramangate is CsH10O3^2-. When it combines with copper (Cu^2+), it forms the neutral ionic compound CuCsH10O3, named copper Paramangate.
Step-by-step explanation:
To determine the formula of the hypothetical polyatomic ion Paramangate, we examine the compound Sodium Paramangate with the formula Na2CsH10O3. Since sodium ions have a charge of 1+, and there are two sodium ions in the compound, the total positive charge is 2+. The polyatomic ion must balance this charge with a 2- charge. Therefore, the formula of the Paramangate ion is CsH10O32-.
When Paramangate combines with copper (Cu2+), the formula must be electrically neutral. As Paramangate has a 2- charge, only one Cu2+ ion is needed to balance the charge of one Paramangate ion. The resulting compound is CuCsH10O3, named copper Paramangate.