Hardness is usually calculated at mg/L CaCO3. First convert 68 g CaSO4 to CaCO3.
68 g CaSO4 x (molar mass CaCO3/molar mass CaSO4) = ?
Then convert g CaCO3 to mg.
Finally, mg CaCO3/10 L = ? mg/L
A hardwater sample contains 68g of CaSO4 in 10litre. Calculate the hardness.
1 answer