Calculate the mass of calcium carbonate present in a 50.00 mL sample of an aqueous calcium carbonate standard, assuming the standard is known to have a hardness of 75.0 ppm (hardness due to CaCO3). Also given is the density of the sample (0.9977g/mL) and the molar mass of CaCO3 (100.0g/mol).

Question

aaronq · Answer

Where are you stuck?

anonymous · Answer

I honestly have no idea where to start on this problem

aaronq · Answer

what does "75 ppm" mean in terms of concentration? can you express that in another form?

anonymous · Answer

I'm not sure.

aaronq · Answer

75 ppm = 75 mg/L

can you try some more now?

aaronq · Answer

I don't think you need anything else but the conversion of ppm to mg/L

anonymous · Answer

Thank you!