Chemistry, 05.10.2021 23:10 josephvcarter
Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask.
Then, using a 10mL pipette you transfer a 12mL aliquot (10mL+2mL) of this solution into a 50mL volumetric flask and dilute up to the mark.
Calculate the % uncertainty.
Answers: 3
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Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)
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Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solu...
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