14
Question
Why is it necessary to
use acetic acid and not sulphuric acid for acidification of sodium
extract for testing sulphur by lead acetate test?
Why is it necessary to use acetic acid and not sulphuric acid for acidification of sodium extract for testing sulphur by lead acetate test?
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Solution
Although the addition
of sulphuric acid will precipitate lead sulphate, the addition of
acetic acid will ensure a complete precipitation of sulphur in the
form of lead sulphate due to common ion effect. Hence, it is
necessary to use acetic acid for acidification of sodium extract for
testing sulphur by lead acetate test.
Although the addition of sulphuric acid will precipitate lead sulphate, the addition of acetic acid will ensure a complete precipitation of sulphur in the form of lead sulphate due to common ion effect. Hence, it is necessary to use acetic acid for acidification of sodium extract for testing sulphur by lead acetate test.
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