GKFix MCQ Question

What is the correct formula for calculating the degree of hardness of water?

• A. (Mass of MgCO₃ / Mass of water) × 10⁶
• B. (Mass of CaSO₄ / Mass of water) × 10⁶
• C. (Mass of CaCO₃ / Mass of water) × 10⁶
• D. (Mass of MgSO₄ / Mass of water) × 10⁶