How do we calculate total hardness, temporary hardness, and permanent hardness using EDTA for a sample?
Understand the Problem
The question involves calculating water hardness using EDTA titration. It provides specific data and calculations for determining total, temporary, and permanent hardness in a water sample.
Answer
Total: 1.25 mg/mL, Temporary: 0.75 mg/mL, Permanent: 0.5 mg/mL
The total hardness is 1.25 mg CaCO3/mL, temporary hardness is 0.75 mg CaCO3/mL, and permanent hardness is 0.5 mg CaCO3/mL.
Answer for screen readers
The total hardness is 1.25 mg CaCO3/mL, temporary hardness is 0.75 mg CaCO3/mL, and permanent hardness is 0.5 mg CaCO3/mL.
More Information
Total hardness includes all dissolved calcium and magnesium ions. Temporary hardness is due to bicarbonates of calcium and magnesium, which can be precipitated by boiling. Permanent hardness remains after boiling and is caused by other compounds.
Tips
A common error is not boiling the sample correctly to remove only temporary hardness or miscalculating the EDTA molarity.
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