https://docs.google.com/open?id=0B5MsG2nmNCEHYjM4M2U5NjItODI3Yi00YzEzLTk2ZDYtZGU2OTAyYmU2MWE5
When testing for solubility in water, you may need to compare one substance to another. Quantity does matter. Be sure to use small amounts. Use a clean sample after the initial iodine and phenolphthalein tests. Vinegar may be used on dry samples and a precipitate is a solid that turns the solution milky.
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