Measure exactly 20 drops of a dilute acid such as vinegar and put these into a test-tube.
Add one drop of indicator; either methyl orange or phenolphthalein is satisfactory. To this
mixture of acid and indicator, add a dilute base drop by drop, and count the drops. Within
experimental error, it will always take the same number of drops to neutralize the 20 drops
of acid provided that the same dropper is used. A teat pipette makes a satisfactory
dropper. If the concentration of the acid is known, the concentration of the base can be
estimated by comparing the numbers of drops of acid and drops of base that just react.
sharon kalunda answered the question on April 12, 2019 at 08:49
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