Water of crystallizationFormula of hydrate ZnSO4•_H2O5. A hydrate of calcium sulfate, CaSO4• XH2O, contains 20.9% water. Calculate the water ofcrystallization (X), and write the formula of the hydrate.Water of crystallizationFormula of hydrate CaSO4 _H2O6. (optional) Plaster of Paris, CaSO4• XH20, is a fractional hydrate; that is, one-water moleculeattaches to more than one formula unit. If a 2.002-g sample has a mass of 1.878 g afterheating, find the water of crystallization (X), and write the formula for Plaster of Paris.

Given: Mass percent of water = 20.9 % Let “X” be the number of moles of water. Mass of water = (X ×…

Answered: Water of crystallization Formula of…

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter13: Isolation Of Eugenol From Clov

Section: Chapter Questions

Problem 9Q

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A salt solution (30% Na2CO3) weighing 1ton iscooled to 20C where the salt crystallizes asdecahydrate. What will be the crystal yield ifthe solubility is 21.5 kg anhydrous Na2CO3/100kg water? (assume that 3% of the totalsolution is lost by evaporation)
Water treatment plants commonly use chlorination to destroy bacteria. A byproduct is chloroform (CHCl3), a suspected carcinogen, produced when HOCl, formed by reaction of Cl2 and water, reacts with dissolved organic matter. The United States, Canada, and the World Health Organization have set a limit of 100. ppb of CHCl3 in drinking water. Convert this concentration into molarity, molality, mole fraction, and mass percent.
What is the concentration of the resulting solution be if 550 mLmL of a 25 %% (m/v)(m/v) glucose solution is diluted to a final volume of 3.0 LL with distilled water? Express your answer in mass to volume percent to two significant figures.
Give the molar concentration of HCl with a specific gravity of 1.18 and has 37.0 % (w/w) purity. (Atomic mass: H = 1.01 amu; Cl = 35.45 amu)
A supersaturated solution of KNO3 is made by dissolving the solute in 100 g of water at 60ºC and then cooling the solution down to 5°C. How many grams of solute would crystallize, or come out of solution?
I wish to prepare 500.0 mL of a 800.0 ppm w/v fluoride (MW = 18.9984 g/mol) solution. a.)How many grams of beryllium fluoride (BeF2, MW = 47.01 g/mol) are needed to prepare this solution? Assume the final solution has a density of 1.00 g/mL. b.) How many grams of beryllium fluoride are needed to prepare 500.0 mL of 0.882 M F−? Thank you!
1. What is the molecular formula for the unknown hydrate?2. What is the percent mass of water in CaSO4•2H2O? Show your calculations.3. Not drying the crucible after washing is a bad mistake. For Part B: If the empty crucible is not heated long enough tocompletely dry it prior to weighing what will be the effect on the calculated percent water in the unknown? (larger orsmaller than the actual value). Explain your answer as clearly as possible.4. Explain the purpose of the desiccator. How would your results differ if you didn’t use it?
Stock phosphoric acid solution is 85% H3PO4 and has a specific gravity of 1.70 . Hence, the molarity of H3PO4 solution that is prepared by diluting 15.0 mL aliquot of H3PO4 stock solution to 135 mL H2O is?
The 1875 Chamber Street fire claimed many victims. A whiskey distillery in Dublin went into flames and released a river of whiskey, crowds gathered along the stream of alcohol to scoop up the liquor using caps, porringers, and other vessels. In all, 13 people died, not because of the fire, but ofalcohol poisoning. a. If the average human weights 137 pounds, the Human LD50 of ethanol is ~2000mg/kg. And the typical content of alcohol in whiskey is 40% . How much alcohol does the average human must drink to succumb to alcohol poison. Assume the density of whiskey is 1 so that 1 ml of whiskey is 1 gram of whiskey. In addition, assume that the LD50 is the amount required to succumb to alcohol poison.
A. FERMENTATION OF CANE SUGAR1. In a 500 mL Florence flask, place 50 gms of brown cane sugar and 1 gram ofdisodium phosphate.2. Dissolve 1 teaspoon of yeast in 15 mL of water. Add this to the sugar in the flasktogether with 150 mL water. Stir until the sugar is dissolved.3. Close the flask with a rubber stopper provided with a delivery tube so that theevolved gas will bubble through a solution of clear limewater.4. HAVE THE SET – UP CHECKED BY YOUR INSTRUCTOR.5. Keep the set – up inside the locker for 5 – 6 days at room temperature.Fermentation Set – up: ________________________________Write the equation for the hydrolysis of cane sugar _____________________________Write the equation for the fermentation of the simple sugars to alcohol __________6. At the end of the fermentation period, what is formed in the flask containinglimewater? _________________________________________________________________Write the equation for its formation ____________________________________________ C.…
Prepare 0.1N H2SO4 solution of 250ml volume. (Density of H2SO4 is 1.84 and purity is 98 %)
a concentrated H2SO4 has the following composition specific gravity 1.84 and purity of H2SO4 is 97 percent by weight. express in mole/L

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