The subject of the experiment: Measuring the total hardness of water. Calculate the dosage (VEDTA). Repeat the measurement three times, calculate the total hardness.
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First, we need to know the concentration of EDTA solution used in the experiment. Let's assume the concentration of EDTA solution is C_EDTA (mol/L). Show more…
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The hardness of water (hardness count) is usually expressed in parts per million (by mass) of $\mathrm{CaCO}_{3},$ which is equivalent to milligrams of $\mathrm{CaCO}_{3}$ per liter of water. What is the molar concentration of $\mathrm{Ca}^{2+}$ ions in a water sample with a hardness count of 175 $\mathrm{mg} \mathrm{CaCO}_{3} \mathrm{L}$ ?
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