Why is it necessary to use acetic acid and not sulphuric 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.
1. Which of the following vitamins is generally excreted by human in urine?
2. The biogas used for cooking is a mixture of which of the following?
3. Which of the following is ozone depleting pesticide ?
4. What happens when a chemical bond is formed
5. Radioactive disintegration of uranium ultimately results in formation of
6. Alum stops bleeding in minor cuts because of
7. The chemical name of quartz is
8. The function of skimming tank in sewage treatment is to remove
9. The natural resource known as black gold is
10. Higher concentration of nitrogen dioxide in atmosphere air causes