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Question I am having trouble with my Chem pre-lab exercise I


I am having trouble with my Chem pre-lab exercise I know I am asking a lot but I really confused. Any help would be appreciated
2.) A 0.5102 g sample of (CaCO_{3}) is dissolved in concentrated HCl (12M). The solution was diluted to 250.0mL in volumetric flask to obtain a solution for standardizing the EDTA titrant.
a.) How many moles of (CaCO_{3}) were used?
b.) what is the molarity of the (CaCO_{3}) in the flask?
c.) what is the molarity of the (Ca^{2+}) ions in flask?
d.) how many moles of (Ca^{2+}) are in a 25.00 mL aliquot of the solution in 2c?
3.) A blank containg a small measured amount of (Mg^{2+}) requires 2.10 mL of EDTA to reach the end point. A 25.00 mL aliquot of the solution from problem 2, which contains the same amount of (Mg^{2+}) as the blank, requires 13.48 mL of EDTA to reach end point.
a.) how many mililiters of EDTA are needed to titrate the (Ca^{2+}) ions in the aliquot?
b.) what is the mole ratio of (Ca^{2+}) ions to EDTA in solution?
c.) given answer in part b, how many moles of EDTA have been dispensed into the flask?
d.) what is the molarity of the EDTA solution?
4.) A 100.0 mL sample of water with unkown amount of calcium ions is titrated with the EDTA solution from problem 3. The same amount of (Mg^{2+}) is added as before. The water sample requires 12.48 mL of EDTA to reach end point.
a.) what volume of EDTA is used to titrate the (Ca^{2+}) in he sample?
b.) how many moles of EDTA are presnt in this volume?
c.) how many moles of (Ca^{2+}) are in the 100 mL sample of water?
d.) If the (Ca^{2+}) originates from calcium carbonate, how many moles of (CaCO_{3}) are present in one liter of water? how many grams of (CaCO_{3}) are in one liter? ____moles/L ___g/L
e.) If 1ppm = 1mg per L, what is the water hardness in ppm of (CaCO_{3}) ? Is this water considered “hard’?

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