The alkalinity of natural waters is usually controlled by OH- (MW = 17.01 g/mole), CO3-2 (MW = 60.01 g/mole), and HCO3- (MW = 61.01 g/mole), which may be present singularly or in combination. Titrating a 100.0-mL sample to a phenolphthalein endpoint requires 18.67 mL of a 0.02812 M solution of HCl. A second 100.0 mL aliquot requires 48.12 mL of the same titrant to reach the methyl orange endpoint. The composition of the sample is ___________ ppm CO3-2 and _________ ppm HCO3- Note: Express final answers using least number of significant figures.
a. The alkalinity of natural waters is usually controlled by OH- (MW = 17.01 g/mole), CO3-2 (MW = 60.01 g/mole), and HCO3- (MW = 61.01 g/mole), which may be present singularly or in combination. Titrating a 100.0-mL sample to a phenolphthalein endpoint requires 18.67 mL of a 0.02812 M solution of HCl. A second 100.0 mL aliquot requires 48.12 mL of the same titrant to reach the methyl orange endpoint.
The composition of the sample is ___________ ppm CO3-2 and _________ ppm HCO3-
Note: Express final answers using least number of significant figures.
b. A 1.963-g sample of an alloy sample requires 27.19 mL of 0.1078 M KSCN to reach the endpoint, the percent Ag (MW = 107.87 g/mole) in the alloy is_________ % ?
Note: Express final answer using least number of significant figures
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