A calcium supplement tablet containing 400mg of Ca is dissolved in 15mL of 8M HC

Question

A calcium supplement tablet containing 400mg of Ca is dissolved in 15mL of 8M HCI with heating, the resulting solution is filtered and then diluted to the mark in a 25mL class A volumetric flask (this is solution A). What dilution is required to analyze the sample to determine the Ca content using the 422.7nm line for Ca with an acetylene- air flame, if the range of analysis is 0.5-30ppm? O a Dilute 10mL of solution A in a 100mL class A volumetric flask O b. Dilute 1mL of solution A in a 100mL class A volumetric flask Oc. Solution A should be analyzed without dilution Od.Dilute 100uL of solution A in a 100mL class A volumetric flask

Explanation / Answer

Answer

d) Dilute 100uL of solution A in a 100ml class A volumetric flask

Explanation

Concentration of solution A = (400mg/25ml)*1000mg = 16000ppm

So, solution A must be diluted for 1000 time to reach the reading ppm range of calcium

procedure d give the required dilution

100uL = 0.1ml

Dilution = 100ml /0.1ml = 1000 time

concentration of Ca in reading solution = 16000ppm/1000 = 16ppm

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