A water sample contains mg of per liter. Its hardness in terms of equivalents (in ppm) is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**Step 1:** Mol. Wt. $CaSO_4 = 136$, $CaCO_3 = 100$. <br>**Step 2:** Hardness = $(\text{mass of } CaSO_4 / 136) \times 100$. <br>**Step 3:** Hardness = $(204 / 136) \times 100 = 1.5 \times 100 = 150$ ppm.