How to convert
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I am currently conducting static scale inhibition evaluation tests. I am preparing a carbonate stock solution (by using reagent-grade sodium bicarbonate to create an aqueous solution with 42.00 g/L of NaHCO3; this solution contains 25 mg/ml of HCO3-, with the amount of HCO3- expressed in terms of CaCO3). I have weighed 42.00 g of NaHCO3 per liter – how do I convert this into a concentration of 25 mg/ml of HCO3-?
It’s 50mg/mL, right? I’m not sure if I’ve got it wrong. 42.00 g/L of NaHCO3 can be converted to 0.5 mol/L; the concentration of HCO3- is therefore 0.5 mol/L. When expressed in terms of CaCO3, the concentration of CaCO3 is also 0.5 mol/L. After performing the unit conversion, the equivalent concentration of CaCO3 is 50 g/L, which is equivalent to 50 mg/mL. Thus, when expressed in terms of CaCO3, the solution contains 50 mg/mL of HCO3-.