Question

D Question 9 2 pts 15.0 ml of a saturated Ca(OH)2 solution is titrated with 0.050 M HCl. The equivalence point is found to be when 17.1 ml of the HCl has been added. What was the initial concentration of the [Ca2+] O 0.0439 M O 0.0285 M 0 0.0219 M O 0.0570 M

Answer 1

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S01 + Given 15.0ml of a saturated cabr) is titrated with 0.050 MHU. Equivalence point = 17.1 ml of HU let Initial concentration of calou), - XM do calon [x & ] Ca2+ + 2011 [x ] [2x] On concentration - 20 M At Equivalence point in Equivalent of lut3 = Equivalent of COM ] Equivalent - Molarity X volume X n-factor Equivalent – û of ut of OR = = Equivalent 0.050 X 17.18 25 x 15 x 2 = 30x. Equating i and (ii); we get 301 = 0.050 X 17-1 = 0-0285 M Mence: Initial concertation of Ca(OH). =0.0285M calon & ca2+ + 2011- of Calt Hence: Initial concentation - Initial concentration of Calou), -0.0285 M Option (b)

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