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1). Calcon another indicator that can be used in calcium titration with EDTA. Indicate how it differs from eriochrome black T.
2) What is the reason for the red and blue coloration of the mixture when adding the indicator?
3) Assuming the water sample contains zinc. What would be done to determine the Ca and Mg present and prevent zinc interference?
4) 0.3785 g of a calcium-containing sample was analyzed by dissolving it in 250 mL and titrating an aliquot of 25 mL. This consumed 18.75 mL of 0.0184 M solution of EDTA. Express the calcium content in:
a) ppm CaO
(b) ppm CaCO3
(c) ppm CaCl2
(d) ppm Ca3 (PO4)2
5) A sample of river water was analyzed by titration an aliquot of 125 mL with EDTA 0.0210 M consuming 22.52 mL. How water hardness can be expressed in ppm of CaCO3.
6). For a water sample it is intended to determine qualitatively the presence of calcium and magnesium ions. Which method or methods make it possible to detect.
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