3 What is a titration? How many moles of EDTA will react with mole of Caco, to f

Question

3 What is a titration? How many moles of EDTA will react with mole of Caco, to form the EDTA-Ca complex shown in Figure 12 one mL the titration of 50 mL of water with 01M EDTA The initial buret reading was and the final buret reading was 35 mL. a. the mmoles of present in the water. Hint: see pre-lab uestion 3 b. and think about the information you have available. 5 c Calculate the in mg/L in the water Create Calculate the concentration in ppm of Caco, found in the water sample a Data Table that will include all the titration data need to calculate the 6. average tota hardness (mg of of of an unknown water sample (remember that you will perform three Write down the net ionic equation that represents with acid with a strong base. the titration of strong 7 You are working with the Soft Water Company and are tasked with mining the concentration of cations removed by their new ion-exchange water Soft30 You collected100 mL of sample and passed it through the Then you titrated th eluate with 15mL of a 0.01M sodium hydroxide solution. Considering that X Resin (aq) esin where X are the total cations found in the water, and OH a. Calculate the moles of X aq exchanged by the resin.

Explanation / Answer

a) moles of X+ = moles of NaOH = moles of H+

= volume x molarity

= 15 ml x 0.01 mol/L

= 1.5 x 10^-4 mol

b) we know that moles of X+ = 1/2 of Ca2+ moles

therefore

moles of Ca2+ = 2 x 1.5 x 10^-4 mol

= 3.0 x 10^-4 mol

c) we have moles of Ca2+ = moles of CaCO3 = 3.0 x 10^-4 mol

and

mass of CaCO3 = moles x molar mass

= 1.5 x 10^-4 mol x 100.0869 g/mol

= 0.015 grams

= 15.0 mg

and

we have 100 ml solution therefore volume = 100 ml = 0.1 L

and

concentration = mass / volume

= 15.0 mg / 0.1 L

= 150.0 mg/L

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