Suppose that X represents an arbitrary cation and that Y represents an anionic species. Using the charges indicated in the superscript of X and Y, fill in the remaining blanks below by writing the appropriate subscript for each X and Y to balance the net charge on the ionic XaYb compound formed (where a and b represent positive, whole numbers of X and Y, respectively). Y- Y2- Y3-
X+
X2+ XY2
X3+

See explanation.

Explanation:

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In this case, when having the cationic and anionic species with the specified charges, in order to abide by the net charge rule, we need to exchange the charges in the form of subscripts and without the sign, just as shown below:

Thus, for all the given combinations, we obtain:

- Y⁻

- Y²⁻

- Y³⁻

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the answer for sodium is 0.186

the answer for rubidium is 0.251

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error