Question
If $100.0 \mathrm{~mL}$ of a water sample is titrated with $0.01000 \mathrm{M}$ EDTA, what is the titer of the EDTA in terms of water hardness/mL?
Step 1
We know that 1 liter is equal to 1000 milliliters, so we have: \[100.0 \, \text{mL} \times \frac{1 \, \text{L}}{1000 \, \text{mL}} = 0.1 \, \text{L}\] Show more…
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A $100 .$ -mL sample of hard water is titrated with the EDTA solution in Problem $2 .$ The same amount of $\mathrm{Mg}^{2+}$ is added as previously, and the volume of EDTA required is $31.84 \mathrm{mL}$ a. What volume of EDTA is used in titrating the $\mathrm{Ca}^{2+}$ in the hard water?_____$mL$ b. How many moles of EDTA are there in that volume?_____$moles$ c. How many moles of $\mathrm{Ca}^{2+}$ are there in the $100 .$ mL of water?_____$moles$ d. If the $\mathrm{Ca}^{2+}$ comes from $\mathrm{CaCO}_{3}$, how many moles of $\mathrm{CaCO}_{3}$ are there in one liter of the water? How many grams of $\mathrm{CaCO}_{3}$ are present per liter of the water?_____$\operatorname{mol} / \mathbf{L}$ ______ $g / L$ e. If $1 \mathrm{ppm}=1 \mathrm{mg}$ per liter, what is the water hardness in ppm $\mathrm{CaCO}_{3} ?$ _____$\mathrm{ppm} \mathrm{CaCO}_{3}$
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