From the masses of the water and anhydrous solid and the molar mass of the anhydrous solid, the number of moles of water and moles of the anhydrous solid are calculated as shown below (\ref{4}, \ref{5}): \[n_{\ce{H2O}} = \frac{m_{\ce{H2O}}}{MM_{\ce{H2O}}} \label{4}\], \[n_{\text{Anhydrous Solid}} = \frac{m_{\text{Anhydrous Solid}}}{MM_{\text{Anhydrous Solid}}} \label{5}\]. chemical reaction changing Copper Sulfate pentaHydrate (CuSO4 . CuSO5HO (s, blue)heatCuSO (s, white)+5HO (g) 3 steps to determining percent water in unknown hydrate. 2) Calculate the mass of water driven out of the hydrate. Water is a very polar molecule which tends to be attracted to . First, the assumption that the hydrate is associated with magnesium sulfate due to its white appearance is proven to be correct. Experiment 605: Hydrates . 7H 2 O) is a heptahydrate of magnesium sulfate: within one mole of magnesium sulfate heptahydrate are seven moles of water. Mass of dish + anhydrous salt (after heating) 5. Heating time and temperature are critically important for this experiment. how do you know when crucible has cooled to room temperature? waters of hydration released as water vapor, leaving solid white anhydrous CuSO, Equation 1 (heating copper (II) sulfate pentahydrate), CuSO5HO (s, blue)heatCuSO (s, white)+5HO (g), 3 steps to determining percent water in unknown hydrate, 1. 8. remove the burner in case of excess spattering. Mass of hydrate 4. Heat the compound gently Note the release of any steam from the beaker. Legal. The water in a hydrate is bound loosely, and so is relatively easily removed by heating. 1.000 g - 0.6390 g = 0.3610 g. 2. Lab Ch 6 Percent Composition Data Table 2: Water in hydrate Remember to record masses to two decimal places 1. 3) Calculate the percent of water in the hydrate. Lab: Determining the Composition of a HydrateFor students in Grades 8-12.INTRODUCTION:Hydrates are ionic compounds that have a number of water molecules attached as part of their structure. An insufficient amount of time for waiting until all water of the hydrate evaporated. Pre-lab: (Show all work and necessary units) In a minimum of one (1) paragraph summarize . Course Hero is not sponsored or endorsed by any college or university. Then allow it to cool and weigh it. We could have not gotten rid of the water in the hydrate to begin with as 15 minutes of heating was perhaps too short.
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