Hardness in groundwater is due to the presence of metal ions, primarily Mg2+ and Ca²+. Hardness is generally reported asppm CaCO,. To measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the presence ofthe indicator Eriochrome Black T, symbolized as In. Eriochrome Black T, a weaker chelating agent than EDTA, is red in thepresence of Ca²+ and turns blue when Ca2+ is removed.redblueCa(In)2+ + EDTA → Ca(EDTA)²+ + InA 50.00 mL sample of groundwater is titrated with 0.0100 M EDTA. If 10.20 mL of EDTA is required to titrate the 50.00 mLsample, what is the hardness of the groundwater in molarity and in parts per million of CaCO, by mass? Assume that Ca2+accounts for all of the hardness in the groundwater.hardness in molarity:M CACO3hardness in parts per million:ppm CaCO3

Hardness of water means amount of the substance dissolved in water. This hardness can be expressed…

Hardness in groundwater is due to the presence of metal ions, primarily Mg²+ and Ca²+. Hardness is generally reported as ppm CaCO,. To measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the presence of the indicator Eriochrome Black T, symbolized as In. Eriochrome Black T, a weaker chelating agent than EDTA, is red in the presence of Ca2+ and turns blue when Ca²+ is removed. red blue Ca(In)2+ +EDTA→ Ca(EDTA)²+ + In A 50.00 mL sample of groundwater is titrated with 0.0100 M EDTA. If 10.20 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO, by mass? Assume that Ca2+ accounts for all of the hardness in the groundwater. hardness in molarity: M CACO3 hardness in parts per million: ppm CaCO3

Hardness in groundwater is due to the presence of metal ions, primarily Mg²+ and Ca²+. Hardness is generally reported as ppm CaCO,. To measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the presence of the indicator Eriochrome Black T, symbolized as In. Eriochrome Black T, a weaker chelating agent than EDTA, is red in the presence of Ca2+ and turns blue when Ca²+ is removed. red blue Ca(In)2+ +EDTA→ Ca(EDTA)²+ + In A 50.00 mL sample of groundwater is titrated with 0.0100 M EDTA. If 10.20 mL of EDTA is required to titrate the 50.00 mL sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO, by mass? Assume that Ca2+ accounts for all of the hardness in the groundwater. hardness in molarity: M CACO3 hardness in parts per million: ppm CaCO3

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Hardness in groundwater is due to the presence of metal ions, primarily Mg2+ and Ca²+. Hardness is generally reported as
ppm CaCO,. To measure water hardness, a sample of groundwater is titrated with EDTA, a chelating agent, in the presence of
the indicator Eriochrome Black T, symbolized as In. Eriochrome Black T, a weaker chelating agent than EDTA, is red in the
presence of Ca²+ and turns blue when Ca2+ is removed.
red
blue
Ca(In)2+ + EDTA → Ca(EDTA)²+ + In
A 50.00 mL sample of groundwater is titrated with 0.0100 M EDTA. If 10.20 mL of EDTA is required to titrate the 50.00 mL
sample, what is the hardness of the groundwater in molarity and in parts per million of CaCO, by mass? Assume that Ca2+
accounts for all of the hardness in the groundwater.
hardness in molarity:
M CACO3
hardness in parts per million:
ppm CaCO3

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