Method Abstract #88, Acidity by Titration

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Acidity by Titration

Method Abstract #88

Scope and Application

This method conforms to Standard Method 2310 B and ASTM D 1067.  The acidity of a water sample is its quantitative capacity to react with a strong base to a designated pH.  The acidity of a solution is based on the total acidic constituent of a solution.

Method Summary

This method involves the titration of a sample with standardized sodium hydroxide to endpoints of pH 3.7 and 8.3, signifying the “methyl orange acidity” and the “phenolphthalein” or total acidity respectively.  Since acidity represents a solution’s specific properties rather than a specific chemical’s concentration, it is measured as an equivalent amount of calcium carbonate.

Sample Titration Curve 


Method Performance


*Data for this measuring range was obtained using laboratory prepared standards formulated from potassium hydrogen phthalate. The measuring range may be increased by using larger capacity analysis vessels and/or auto-dilution.

**The Method Detection Limit (MDL) was determined based on data obtaining a coefficient of variance better than 30%. Results may differ depending on laboratory practices and sample matrix.

RSD values are better than those specified in Standard Methods 

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