Question

I need help please.

was titrated with a 1.00 x 10M EDTA solution. It took A 12.0 mL sample of water from a kitchen tap was titrated with a 1.00 x 102 MED 1.00 mL of the EDTA solution to change the indicator from red to blue. 1) What is the total number of moles of Ca* + Mg in the Swan Lake water sam Cake water sample? mmoles of EDTA 1.00.102.1.00m2 =1.00.102 mme Ca 2+ + m2tions = 1.00 10² mmol =1.00.10².10 mee =1.00 tion of Ca2+ + Mg2+ ions in the tap water sample expressed as 10 mo 2) What is the total concentration of Ca2+ + Mg2+ ions in the tap wat mmol/L? 3) What is the water hardness of the sample expressed in units of mg/L of Caco, (molar mass is 100.1 g/mol)? 4) Another 12.0 mL sample from Swan Lake is titrated at pH 12.5. At high pH, Mgo forms solid Mg(OH)2. What is this process called? 5) At pH 12.5, the concentration of Car is 0.667 mmol/L. What is the concentration of Mg? in the tap water sample?

Answer 1

In the question, the Statement and Data is given, only for the Tap Water Sample, no Data for the sample from Swan Lake is given. So, I am solving only questions no. 2,3,4,5.

Q no. 4) The Process is called PRECIPITATION.

27 Concentration of Ca2*+ Maintain Tap-Water Sample = 1922022 (Chingo us. =vs.) 9= **10-2%) = -x 10 Z+10°mmelfe = mmol /= 70-833 mmol/4 3) The Hondness of water is simply proportional to the amount of disduced Ca and Ma nolls. Concentration of total (Cant mat - 0-833 mmol/L = 8-334104 mol/L .Equivalent Amount of lado, por 833-10-4(m) dissolved Coht mit) =160148-33404 = 0.083%m - (23:42 mal ... The Water Hardness of the Sample is 483-42 male of CaCO₃ 5) [cat my at 7- 0-833 mmol/L [C224 ] = 0+667 mmol/L -- [* ) - 0-833-0-6672f0-86 mmol/2 Thuy, the concentration of Math in the the 14 water sample is 10.166mmal i