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Ca2+Ca^{2+}Ca2+ and Mg2+Mg^{2+}Mg2+ ions
Titration with EDTA solution
Eriochrome Black T
Wine-red to blue
0.01 M
pH 10
50 cm³
2-3 cm³
0.03 g
Deep wine-red
1:1 ratio
Maintain pH 10 for stable complexes with Ca2+Ca^{2+}Ca2+ & Mg2+Mg^{2+}Mg2+
Overestimate total hardness
Boil water first, then titrate with EDTA
ppm of CaCO3CaCO_3CaCO3
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