The mass of a calcium tablet is 1 g , after crush it and dissolved it in 25 ml o
ID: 1046656 • Letter: T
Question
The mass of a calcium tablet is 1 g , after crush it and dissolved it in 25 ml of 3 M HCL in a 250 beaker. The we transfer it to 250 volumetric flask and fill it with water. The took 5 ml from the volumetric flask and add 20ml water and 10 ml buffer with ph of 10 then we add 8 drops of indicator and start the titration for 3 trails. We found that the mass of tablet is 0.237 g and the actual mass of calcium tablet is 1 g . The difference is 23.7% ! Why there are difference? The mass of a calcium tablet is 1 g , after crush it and dissolved it in 25 ml of 3 M HCL in a 250 beaker. The we transfer it to 250 volumetric flask and fill it with water. The took 5 ml from the volumetric flask and add 20ml water and 10 ml buffer with ph of 10 then we add 8 drops of indicator and start the titration for 3 trails. We found that the mass of tablet is 0.237 g and the actual mass of calcium tablet is 1 g . The difference is 23.7% ! Why there are difference?Explanation / Answer
Actually in titration we can find the concentration of calcium ion only. From the concentration of calcium ion we may find the mass of calcium present in the tablet. But in tablet calcium is in the form of calcium compounds.
Calcium tablets may be calcium carbonate, calcium citrate, calcium gluconate, calcium lactate and calcium phosphate. So 0.237g is only the mass of calcium present in the tablet, remaining amount (1-0.237)g may be the anion part in tablet.
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