Unknown Powder K Test Lab Report
Claim: Through the tests performed in lab, it was concluded that unknown powder E was NaHCO₃, powder K was MgSO₄ and powder V was cornstarch. Evidence: Unknown element E was first tested with phenolphthalein and the solution turned pink, this test left 3 possible compounds; NaHCO₃, Na₂CO₃, and CaCO₃. Next the compound was tested with iodine and the solution turned yellow showing that now there was two compounds that could be the identity of unknown powder E; NaHCO₃ and CaCO₃. After that compound E was tested for being soluble in water, the powder was soluble, this proved that unknown element E is NaHCO₃. Unknown Element K was also first tested following the steps for the phenolphthalein test and the compound turned clear, this test ruled out NaHCO₃, Na₂CO₃, and CaCO₃. Second the unknown powder was tested with iodine and the solution turned yellow, leaving NaCl, CaSO₄ and MgSO₄ as possible identities of unknown powder K. Considering this it was next tested for solubility in H₂O, and it was concluded that the compound was soluble. Next the unknown element was tested with sodium hydroxide and a white precipitate formed proving that unknown powder K was MgSO₄ because NaCl and CaSO₄ were ruled out. The last powder tested was unknown element V. Like the other powders …show more content…
Second unknown element V was tested with iodine and the solution turned a deep
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