Question

1.Why hydrogen sulphide is used in limit test for heavy metal ?
2.Glycerin is added in the assay of boric acide why?
Answer please ​

Answer 1

Answer:

1.Hydrochloric acid helps to make solution acidic and the barium sulphate precipitate formed is insoluble which gives turbidity. 17. Compare the turbidity produced in the test solution with the standard turbid solution.

2.Boric acid is a weak monobasic acid therefore it does not react easily with NaOH as it does not have more tendency to give hydrogen ions in its solution. Therefore we add glycerol in it. ... It helps for the titration of boric acid with base in the presence of certain acid- base indicators such as phenolphthalein

Explanation:

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Answer 2

Answer:

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1.Why hydrogen sulphide is used in limit test for heavy metal ?

2.Glycerin is added in the assay of boric acide why?

$\huge{\bf{\blue{\fbox{\underline{\color{red}{Answer✩}}}}}}$

1.Hydrochloric acid helps to make solution acidic and the barium sulphate precipitate formed is insoluble which gives turbidity. 17. Compare the turbidity produced in the test solution with the standard turbid solution.

2.Boric acid is a weak monobasic acid therefore it does not react easily with NaOH as it does not have more tendency to give hydrogen ions in its solution. Therefore we add glycerol in it. ... It helps for the titration of boric acid with base in the presence of certain acid- base indicators such as phenolphthalein.

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