An unknown Ca solution was prepared by weighing a 2.122 g sample, dissolving it in HCl and then titrating this unknown Ca2+ solution with 41.72 mL of a 0.1160 M standard EDTA solution to reach the endpoint at pH = 10.00 using Eriochrome Black T indicator. Calculate the % CaO in the sample [MW CaO = 56.08 g/mol; AW Ca = 40.08 g/mol]. The reaction is a 1:1 Ca:EDTA relationship.

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Q: Can you explain the problem?

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Q: Answer 7c

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Q: A 50.0ml of ocidic solute (K, = 2.6x 102) is titrated with a 25.0 ml of 0.001 M NOOH solution. Which…

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Q: pH = %3D

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Q: O 4.6

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A: Answer :

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