The lab tells us to prepare 50 mL of a 1000 ppm stock solution of calcium using

Question

The lab tells us to prepare 50 mL of a 1000 ppm stock solution of calcium using calcium chloride dihydrate (FW: 147.01 g). Show your calculations for how you would prepare the 1000 ppm standard. Thank you ! The lab tells us to prepare 50 mL of a 1000 ppm stock solution of calcium using calcium chloride dihydrate (FW: 147.01 g). Show your calculations for how you would prepare the 1000 ppm standard. Thank you ! The lab tells us to prepare 50 mL of a 1000 ppm stock solution of calcium using calcium chloride dihydrate (FW: 147.01 g). Show your calculations for how you would prepare the 1000 ppm standard. Thank you !

Explanation / Answer

CaCl2*2H2O

V = 50 mL,

C = 1000 ppm

define ppm

ppm = parts per million = mg of solute / liter of solutino

therefore

V = 50 mL = 501*0^-3 L

1000 ppm = x mg /(50*10^-3) L

x = (1000)(50*10^-3)  

x = 50 mg of CaCl2*2H2O

then

add

50 mg of CaCl2*2H2O into v = 50 mL, this will be 1000 ppm

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