A sample of a mixture containing CaCl 2 and MgCl 2 weighed 2.000 g.The sample wa
ID: 817117 • Letter: A
Question
A sample of a mixture containing CaCl2and MgCl2weighed 2.000 g.The sample was dissolved in water, and H2SO4was added until the precipitation of CaSO4was complete.
CaCl2(aq) + H2SO4(aq) ? CaSO4(s) + 2HCl(aq)
The CaSO4was filtered, dried completely, and weighed. A total of 0.545 g of CaSO4was obtained.
How many moles of Ca2+were in the CaSO4?
How many moles of Ca2+were in the original 2.000-g sample?
How many moles of CaCl2were in the 2.000-g sample?
How many grams of CaCl2were in the 2.000-g sample?
What was the percentage by mass of CaCl2in the original mixture?
What was the percentage by mass of MgCl2in the original mixture?
Explanation / Answer
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