Homework Answers
millimoles of EDTA = 15 x 0.1040 = 1.56
millimoles of EDTA = millimoles of CaCO3
moles of CaCO3 = 1.56 x 10^-3
mass of CaCO3 = 1.56 x 10^-3 x 100
= 0.156 g
mass of CaCO3 = 156 mg
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QUESTION 4 A 500.0 mL water sample is titrated with 15.00 mLof 0.1040 M EDTA. How...
A 50.00 mL aliquot of a hard water sample is titrated with 15.00 mL of 0.01280...
A 50.00 mL aliquot of a hard water sample is titrated with 15.00 mL of 0.01280 M EDTA. A second 50.00 mL aliquot portion is made sufficiently alkaline with NaOH to precipitate the Mg ions. The precipitate was filtered and the filtrate was titrated with 10.00 mL of 0.01280 EDTA. Calculate the ppm Mg and Ca in the water sample.
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA...
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA molarity? 2. A 250.0 mL water sample requires 30.85 mL of the EDTA solution from question 1 to reach the calmagite endpoint. What was the molarity of the hard metal ions in the water sample? 3. If the metal ions in the water sample of question 2 are assumed to be Ca2+ from CaCO3, express the concentration in ppm...
Problem 4: EDTA titration with 16.55 ml of o.0114 M EDTA at pH-10. A 50.0 mL sample of water containing both Ca? and Mg is titrated in another 50.0 mL sample, the Mg* was precipitated as Mg(OH)2...
Problem 4: EDTA titration with 16.55 ml of o.0114 M EDTA at pH-10. A 50.0 mL sample of water containing both Ca? and Mg is titrated in another 50.0 mL sample, the Mg* was precipitated as Mg(OH)2 and then, Ca2* was titrated at pH 13 with 9.25 ml of the same EDTA solution. Calculate ppm CaCo, (FW-100.09) and MgCO, (FW-84.31) in the sample. FWca: 40.08; FWm: 24.30
Problem 4: EDTA titration with 16.55 ml of o.0114 M EDTA at pH-10....
23. A 25.00 mL water sample is titrated with a 0.0120 M EDTA solution. The equivalence...
23. A 25.00 mL water sample is titrated with a 0.0120 M EDTA solution. The equivalence point is reached when 17.0 mL of the EDTA is added. The hardness in the sample was ppm CаCОз. a) 817 b) 219 c) 120 d) 346 e) none of the above
A 3.7145-g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enough distilled water to...
A 3.7145-g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enough distilled water to prepare 1.000 liter of solution. A 100.0-mL water sample was adjusted to pH 10 and titrated to endpoint with 11.23 mL of the EDTA solution. Calculate the concentration of the EDTA solution and th e hardness of the water sample. Express the hardness of mg caCO3 /L.
A 100 mL sample of 0.060 M is titrated with 0.060 M EDTA at pH 9.00....
A 100 mL sample of 0.060 M is titrated with 0.060 M EDTA at pH 9.00. The value of Kf for the Ca^2+ -EDTA complex is 10.65 and the fraction of free EDTA in the Y^4- form, ay+ , is at pH 9.00. The Y4- was not given how am i suppose to solve this. What is Kf' , the conditional formation constant, for CA^2+ at pH 9.00? What is the equivalence point volume, Ve, in milliliters? Calculate the concentration...
0.1001 Sample Volume ViEDTA VI EDTA 0135L 02して'8_1 O1241L AVEDTA ,moles EDTA moles EDTA Moles E...
0.1001 Sample Volume ViEDTA VI EDTA 0135L 02して'8_1 O1241L AVEDTA ,moles EDTA moles EDTA Moles EDTA Molesca2. Sample [Ca2* moles Ca moles Ca2 mg CaCO3 mg CaCO3 Sample Hardness USGS Hardness Classification mg CaCO3 Accepted Hardness % Error Chemicals, Materials and Equipment Eriochrome Black T indicator solution (0.4 g/L) Disodium EDTA solution (0.0100 M) Ammonia/Ammonium Chloride Buffer (pH 10) Magneisum Chloride Solution (1x103 M) Saturated CaSO4 solutions previously prepared and equilibrated to 60°C and 90°0C hot/stir plate 60°C and 90°C...
Chapter 15 Determination of the Hardness of Water 3, A 100-mL. sample of hard water is...
Chapter 15 Determination of the Hardness of Water 3, A 100-mL. sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg' is added as previously, and the volume of EDTA required is 31.84 mL a What volume of EDTA is used in titrating the Ca" in the hard water? mL h How many moles of EDTA are there in that volume? moles c. How many moles of Ca are there in the...
A 120.0 mL sample of 0.040 M Ca2+ is titrated with 0.040 M EDTA at pH...
A 120.0 mL sample of 0.040 M Ca2+ is titrated with 0.040 M EDTA at pH 9.00. The value of logKf for the Ca2+−EDTA complex is 10.65 and the fraction of free EDTA in the Y4− form, αY4−, is 0.041 at pH 9.00. What is Kf′, the conditional formation constant, for Ca2+ at pH 9.00? Kf′= What is the equivalence point volume, Ve, in milliliters? Ve= mL Calculate the concentration of Ca2+ at V=12Ve. [Ca2+]= M Calculate the concentration...
A 140.0 mL sample of 0.080 M Ca2+ is titrated with 0.080 M EDTA at pH...
A 140.0 mL sample of 0.080 M Ca2+ is titrated with 0.080 M EDTA at pH 9.00. The value of log?f for the Ca2+−EDTA complex is 10.65 and the fraction of free EDTA in the Y4− form, ?Y4− , is 0.041 at pH 9.00. What is ?′f , the conditional formation constant, for Ca2+ at pH 9.00? ?′f= What is the equivalence point volume, ?e , in milliliters? ?e= mL Calculate the concentration of Ca2+ at ?=12?e . [Ca2+]= M...
Problem 4: EDTA titration with 16.55 ml of o.0114 M EDTA at pH-10. A 50.0 mL sample of water containing both Ca? and Mg is titrated in another 50.0 mL sample, the Mg* was precipitated as Mg(OH)2 and then, Ca2* was titrated at pH 13 with 9.25 ml of the same EDTA solution. Calculate ppm CaCo, (FW-100.09) and MgCO, (FW-84.31) in the sample. FWca: 40.08; FWm: 24.30
Problem 4: EDTA titration with 16.55 ml of o.0114 M EDTA at pH-10....
23. A 25.00 mL water sample is titrated with a 0.0120 M EDTA solution. The equivalence point is reached when 17.0 mL of the EDTA is added. The hardness in the sample was ppm CаCОз. a) 817 b) 219 c) 120 d) 346 e) none of the above
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Chapter 15 Determination of the Hardness of Water 3, A 100-mL. sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg' is added as previously, and the volume of EDTA required is 31.84 mL a What volume of EDTA is used in titrating the Ca" in the hard water? mL h How many moles of EDTA are there in that volume? moles c. How many moles of Ca are there in the...
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