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The alkalinity of natural waters is usually controlled by OH- , CO3 2- , and HCO3...

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Chemistry

The alkalinity of natural waters is usually controlled by OH- ,CO3 2- , and HCO3 - , which may be present alone or in combination.Titrating a 100.0 mL sample to a pH of 8.3 requires 18.70 mL of a0.0281 M solution of HCl. A second 100.0 mL aliquot requires 48.20mL of the same titrant to reach a pH of 4.5. Calculate theconcentrations of CO3 2- and HCO3 - in ppm.

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4.2 Ratings (686 Votes)
As mentioned there is no hydroxide ion concentration in the solution the 100mL sample required 1870mL of HCl solution to reach the pH 83 Hence The first equivalence point    See Answer
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