The calcium tablet analyzed for your projects is composed mainly of calcium (in

Question

The calcium tablet analyzed for your projects is composed mainly of calcium (in the form of calcium carbonate, FM = 100.09 g/mol) and other inert filler materials. A 0.1364-gram sample of the tablet was pulverized, dissolved in acid, and diluted to the mark in a 1-L volumetric flask. The resulting solution was analyzed by flame atomic absorption spectroscopy and was found to contain 45.21 ppm Ca2+ If a tablet weighs 1.8000g, calculate the mg of calcium (atomic mass = 40.078 g/mol) per tablet.

(a) 498.0 mg (b) 596.6 mb (c) 614.2 mg (d) 550.1 mg

Please show calculations

Explanation / Answer

given [Ca+2] = 45.21 ppm = 45.21 mg/lt

1litre of solution is containing 45.21 mg or 0.04521 gm of Ca

that means 0.1364 gm. of sample tablet is containing 0.04521 gm of Ca

% of Ca^+2 = (0.04521/0.1364)*100

% of Ca^+2 = 33.14 %

given 1.8000 gm of tablet

so weight of Ca^+2 = 1.8000*33.14/100 = 0.5966 gm

weight of Ca^+2 in mg = 596.6 mg

so option b is correct answer

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