How to prepare 250ml (n/10) sodium hydroxide solution (NaoH)
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To prepare a 250ml (n/10) sodium hydroxide (NaOH) solution, you will need to follow these steps:
1. Calculate the amount of NaOH required:
- The term (n/10) indicates a 1/10th normal solution, which means that the concentration of the solution is one-tenth of the molar concentration of NaOH.
- The molar mass of NaOH is 40.00 g/mol, so for a (n/10) solution, you will need (1/10) * 40.00 g.
- Calculate the amount of NaOH needed in grams.
2. Convert grams to moles:
- Divide the mass obtained in step 1 by the molar mass of NaOH (40.00 g/mol) to get the number of moles of NaOH needed.
3. Determine the volume required:
- A (n/10) solution means that it contains one-tenth of the molar concentration, so the number of moles required is also one-tenth of what you would need for a normal solution.
- Since a normal solution is 1 liter, for (n/10) solution, you need one-tenth of that, which is 0.1 liters or 100 ml.
- However, you want to make a 250ml solution, so adjust the number of moles required accordingly.
4. Calculate the concentration of the solution:
- Divide the number of moles obtained in step 2 by the volume of the solution in liters (250/1000).
5. Weigh the required amount of NaOH:
- Measure the calculated mass of NaOH on a balance, ensuring accuracy, and transfer it to a clean, dry container or beaker.
6. Add distilled water to the container:
- Gradually add distilled water to the container, dissolving the NaOH completely. Stir gently with a glass rod until the solid is fully dissolved.
7. Transfer the solution to a volumetric flask:
- Once the NaOH is dissolved, carefully pour the solution into a 250ml volumetric flask.
8. Rinse the container and add the rinsed liquid to the volumetric flask:
- Rinse the container used to dissolve NaOH with distilled water to ensure the complete transfer of NaOH solution. Add the rinsed liquid to the volumetric flask.
9. Fill the volumetric flask up to the mark:
- Add distilled water to the volumetric flask slowly until the bottom of the meniscus aligns with the calibration mark, ensuring the total volume reaches 250ml.
10. Mix the solution:
- Secure the stopper on the volumetric flask, ensuring it is tight, and mix the solution well by inverting and shaking the flask gently.
And that's how you prepare a 250ml (n/10) sodium hydroxide solution (NaOH).