A 100-ml sample of water is titrated with 0.02 N H2SO4. The initial pH is 9.5, and

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A 100-ml sample of water is titrated with 0.02 N H2SO4. The initial pH is 9.5, and 6.2 mL of acid is required to reach the pH 8.3 endpoint. An additional 9.8 mL is required to reach the 4.5 endpoint. Determine the species of alkalinity present and the concentration of each species