Question 1 of 8 saplingingaming Map Hatdhess groundwater is due to the presence

Question

Question 1 of 8 saplingingaming Map Hatdhess groundwater is due to the presence of metal ions. primarily Mot and CatHardness generaly reported as ppm CaGO To measure water hardness, a sample of groundwater is titrated with EDIAa chelating agent, in the bresence of the indicator eriochtome black T, symbolized here as n black f a weaker chelating agent than EDTA, is red in the presence of Cart and turns blue Ted blue 00-mu sample of croundwater is titrated with o0750 M EoTA. Assume that Ca?t accounts for all o härdness nthe groundwater. 1040 mL of EDTAIS required to titrate the 50.00-ml sample, what is gr rA.th. parts perimition of CaCo mass? ve Up & v

Explanation / Answer

moles of EDTA = 10.40 x 0.0750 / 1000 = 7.8 x 10^-4 mol

moles of EDTA = moles of Ca+2

moles of Ca+2 = 7.8 x 10^-4 mol

volume of Ca = 50 mL

Molarity of Ca+2 = 7.8 x 10^-4 / 0.050

= 0.0156 M

Molarity of Ca+2 = Molarity of CaCO3

Molarity of CaCO3 = 0.0156 M -----------------> answer 1

b)

Molarity = 0.0156 mol / L

= 0.0156 mol/L x 100 g/mol

= 1.56 g/L

= 1560 mg/L

concentration of CaCO3 = 1560 ppm ---------------> answer 2

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.