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A Zeolite Softener was completely exhausted by passing 20,000 litres of water sample through it. If the Zeolite requires 150 litres of 5.5% NaCl solution for complete regeneration, calculate the hardness of the water sample.
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15 grams of NaCl is dissolved completely in a beaker containing 200mL of water. What is the Na+ concentration in moles/liter in the final solution?
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