Final answer:
A PIMI floater suitable for a diamond ring would be potassium iodide and lead(II) nitrate due to their different solubilities in water.
Step-by-step explanation:
A PIMI floater suitable for a diamond ring would be potassium iodide and lead(II) nitrate. This is because the solubility of potassium iodide (KI) and lead(II) nitrate (Pb(NO3)2) in water is significantly different.
Potassium iodide is highly soluble in water, meaning it dissolves easily. However, lead(II) nitrate is only slightly soluble in water, so it forms a precipitate when mixed with water.
When combined, the potassium iodide will dissolve in the water, while the lead(II) nitrate will remain as a solid (floater) in the solution. This forms a visually appealing floater effect in the diamond ring.