Markis FisherUsing the equation from graph 2, plug in each of the absorbance values separately and attain the Xvalue which is the concentration for Mg2+Sample calculations for Mg2+using the equation from graph-2, Y=0.0086x + 0.009We do the same calculations as we did for the Calcium. Plug each value for each member separately ofthe Mg2+Absorbance value to get X1.Y=0.0086x + 0.0092.Place the absorbance of each value for each member to Y and then subtract 0.0093.Divide by 0.00864.And attain X which is the concentrationIf there is a dilution factor multiply answer by 2, to account for the 1:1 ratioHardness value of the test samples in ppm CaCO3Table 8: Hardness of each members water sample using data from Table 6 and 7.Sample calculations for the conversion of Mg2+and Ca2+into ppm CaCO31.Multiply the calculated Ca2+concentration (ppm) with molar of CaCO3(5.8 ppm Ca2+) x (100.9 gCaCO3/1 mole CaCO3) x (1 mole Ca2+/ 40.08g Ca2+) =14.6 ppm CaCO32.Multiply the calculated Mg2+concentration (ppm) with the molar mass of CaCO3(-2.1 ppm Mg 2+) x (100.9 g CaCO3/ 1 mole CaCO3) x (1 mole Mg2+/ 24.31 g Mg 2+) = -8.7 ppmCaCO33.Add the two values (Mg2+and Ca2+) to get the ppm CaCO314.6 ppmCaCO3+(-8.7 ppm CaCO3) =5.9 ppm CaCO3You do each of these steps (1-3) for each member of the groups data separatelyResults of EDTA titrations for unsoftened waterSampleDrops to reachequivalence point(average)Concentration of CaCO3(moles/L)Concentration of CaCO3(ppm)Markis Fisher undilutedbottled water1.53E-430SampleHardness value in ppmMarkis Fisher (bottled water undiluted, fromSam’s club)5.9Daniel Flaks (undiluted tap water from lab room110 in Whitmore lab)238Nicolas Elgie (rainwater undiluted from puddle/pond)530Andrew Eyster (Zero water filter from faucet athome undiluted)-7

Markis FisherDaniel Flaks (tap waterfrom lab room 110 inWhitmore) undiluted51.01021020Nicolas Elgie (undilutedrainwater frompuddle/pond36E-460Andrew Eyster (zerowater filter from faucetat apartmentundiluted).142.8E-52.8Table 9: This graph is the calculated concentration of CaCO3in ppm using unsoftened number of drops.This table shows the calculated values of CaCO3of unsoftened water using the equation M1V1=M2V2where drops refers to volume(V)and M1is the molarity concentration of EDTA and V2is the number ofdrops before the color changed. Then able to use the equation to find the molarity.Calculations of concentration in molesM(EDTA) x V(EDTA)= M(Sample-1) x V(Sample-1)M(EDTA) x V(EDTA)/V(Sample-1)=M(Sample-1)(2.00 x 10 ^-4 M EDTA) x (1.5 drops) / 1 drop=3E-4 moles/LCalculation of concentration of CaCO3in ppm(3E-4 M CaCO3/L) x (100g CaCO3/ 1 mole CaCO3) x (1000mg/ 1 g) = 30 ppm CaCO3Results of EDTA titrations of Resin softened waterSampleDrops to reachequivalence point(average)Concentration ofCaCO3(moles/L)Concentration of CaCO3in ppmMarkis Fisher Bottledwater undiluted1.53E-430Daniel Flaks tap waterfrom lab in room 110Whitmore undiluted12E-420Nicolas Elgie undilutedrainwater frompond/puddle1.53E-430Andrew Eyster zerowater filter from home

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Term

Spring

Professor

KEISER,JOSEPH

Tags

Markis Fisher