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Hardness ( EDTA ) mgCaC O 3 L = A N 5 0 , 0 0 0 ( m L ) s a m p

Hardness (EDTA) mgCaCO3L=AN50,000(mL)sample
Where:
A=mL EDTA titrant (6.4)
N= normality of EDTA titrant
50.0mL tap water sample.
13.75mL EDTA used in the titration.
a) Calculate the moles of EDTA used.
b) Calculate the molarity of metal ion present in the tap water sample (Remember: EDTA binds to metal ions on a 1:1 molar ratio).
c) Find the ppm calcium ion concentration in the sample based
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