In the hardness calculation Hardness = [A*B*1000]/(mL of sample), what does B represent?

In the hardness calculation Hardness = [A*B*1000]/(mL of sample), what does B represent?

• A. mg CaCO3 equivalent to 1.00 EDTA titrant
• B. Molarity of EDTA titrant
• C. Volume of sample
• D. Mass of CaCO3 titrant

Answer: (A)

Hardness is reported as mg/L of CaCO3, so the calculation must convert the amount of titrant used into calcium carbonate equivalents. The B factor is the mg CaCO3 equivalent that corresponds to a fixed amount of EDTA titrant, typically per 1 mL of titrant. Because Ca2+ and EDTA react in a 1:1 ratio, each milliliter of titrant represents a specific CaCO3 amount. Multiplying the titrant volume used by this conversion gives the total CaCO3 equivalents titrated; then multiplying by 1000 and dividing by the sample’s volume converts that to mg/L CaCO3 hardness. The other choices don’t describe this conversion: the molarity of EDTA isn’t the direct factor in this form, the sample volume isn’t what’s being converted, and the mass of CaCO3 titrant isn’t the right quantity for this calculation.

Hardness is reported as mg/L of CaCO3, so the calculation must convert the amount of titrant used into calcium carbonate equivalents. The B factor is the mg CaCO3 equivalent that corresponds to a fixed amount of EDTA titrant, typically per 1 mL of titrant. Because Ca2+ and EDTA react in a 1:1 ratio, each milliliter of titrant represents a specific CaCO3 amount. Multiplying the titrant volume used by this conversion gives the total CaCO3 equivalents titrated; then multiplying by 1000 and dividing by the sample’s volume converts that to mg/L CaCO3 hardness. The other choices don’t describe this conversion: the molarity of EDTA isn’t the direct factor in this form, the sample volume isn’t what’s being converted, and the mass of CaCO3 titrant isn’t the right quantity for this calculation.