Save Question 2 (10 points) A 0.4422 g sample of CacO3 is dissolved in 12 M HCI

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Save Question 2 (10 points) A 0.4422 g sample of CacO3 is dissolved in 12 M HCI and diluted to 125.0 mL in a volumetric flask.What is the molarity of Ca2+ in the sample? (Mw CaCO3 = 100.1 g/mol). Express answers as decimals, not exponents. Your Answer: Answer units Save Question 3 (10 points) A 0.3309 g sample ot CaCOs is dissolved in 12 M HOl and diluted to 1000 mL in a volumetric flask. A 25.00 mL aliquot is removed from the flask How many moles of Caf are in this aliquot? (MW caco3 100 1 g/mol) Express answe

Explanation / Answer

moles of CaCO3 = 0.4422g/100.1 g

As all the CaCO# is reacted with HCl as

CACO3 (s) + 2 HCl (aq) ------------------> CaCl2 (aq) + CO2 (g) + H2O(l)

and converted to CaCL2 solution.

Thus the moles of Ca+2 are same in the solution.

MOles of Ca+2 taken = moles of CaCO3 taken = 0.4422/100.1

The total volume of solution = 125mL

Thus molarity of Ca+2 in solution = moles /volume in L

= (0.4422/100.1) /0.125L

=0.03534 M

= 0.03534 mol/L

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