How much mL of dilute nitric acid is needed to add in control solution in chloride limit test in sodium hydroxide sample???can u please give me Answer urgently??
To determine the amount of dilute nitric acid needed for the chloride limit test in a sodium hydroxide sample, you will need to follow a specific procedure. Here are the general steps:
1. Prepare the control solution:
- Take a known volume of distilled water (e.g., 100 mL) in a beaker.
- Add a known volume of a standard chloride solution (e.g., 10 mL) to the water.
- This solution will be used as a reference to compare against the sodium hydroxide sample.
2. Take a known volume of the sodium hydroxide sample (e.g., 10 mL) in a separate beaker.
3. Add a few drops of phenolphthalein indicator to both the control solution and the sodium hydroxide sample. Phenolphthalein will help indicate when the reaction is complete.
4. Titrate the sodium hydroxide sample:
- Slowly add the dilute nitric acid (usually standardized against a known concentration of sodium carbonate solution) to the sodium hydroxide sample while swirling the mixture.
- As you add the nitric acid, the chloride ions in the sodium hydroxide sample will react, forming silver chloride precipitate.
- Continue adding the nitric acid until a faint pink color persists in the sample.
5. Record the volume of dilute nitric acid used.
The amount of dilute nitric acid needed for the chloride limit test will depend on the concentration of chloride ions present in the sodium hydroxide sample. The exact volume required can only be determined through experimentation following the procedure described above.