How do I prepare 10% ortho-phosphoric acid in 250ml volumetric flask from 85% ortho-phosphoric acid(density 1.69g/ml) ?
To prepare a 10% ortho-phosphoric acid solution in a 250ml volumetric flask from 85% ortho-phosphoric acid, follow these steps:
1. Calculate the amount of 85% ortho-phosphoric acid needed. Since the solution is 85% ortho-phosphoric acid, the remaining 15% is water. Therefore, you need to dilute the solution with water by a factor of (85/10) = 8.5.
2. Determine the volume of the 85% ortho-phosphoric acid needed by dividing the desired final volume by the dilution factor:
Volume of 85% ortho-phosphoric acid = (250ml / 8.5) = 29.41ml
3. Calculate the mass of the 85% ortho-phosphoric acid needed using its density:
Mass = Volume x Density = 29.41ml x 1.69g/ml = 49.7479g (rounded to 49.75g)
4. Measure 49.75g of the 85% ortho-phosphoric acid using a balance. Ensure you use proper safety precautions while handling chemicals.
5. Transfer the measured 85% ortho-phosphoric acid to the 250ml volumetric flask.
6. Add distilled water to the flask up to the mark on the neck.
7. Cap the flask and mix the solution thoroughly to ensure full dissolution of the ortho-phosphoric acid.
Now you have prepared a 10% ortho-phosphoric acid solution in a 250ml volumetric flask.
To prepare 10% ortho-phosphoric acid in a 250ml volumetric flask, you would need to calculate the volume of the concentrated 85% ortho-phosphoric acid and then add an appropriate amount of water to reach the final volume of 250ml.
Here are the steps to follow:
1. Calculate the volume of the concentrated 85% ortho-phosphoric acid required using the following equation:
Volume of concentrated acid = (required volume / desired concentration) * (concentration of acid)
In this case, the required volume is 250ml and the desired concentration is 10%. The concentration of the concentrated acid is 85%. So the equation becomes:
Volume of concentrated acid = (250ml / 10%) * (85%) = 2125ml
Therefore, you will need 2125ml of the 85% ortho-phosphoric acid.
2. Now, you need to convert the volume of the concentrated ortho-phosphoric acid into its mass. Since we know the density of the acid, we can use the following equation:
Mass of concentrated acid = Volume of concentrated acid * Density
In this case:
Mass of concentrated acid = 2125ml * 1.69 g/ml = 3594.25g
Therefore, you will need 3594.25g of the 85% ortho-phosphoric acid.
3. After measuring the correct amount of concentrated acid, transfer it carefully into a beaker.
4. Gradually add distilled water to the beaker while stirring until the final volume reaches 250ml. Be sure to stir the solution thoroughly to ensure proper mixing.
5. Once you have achieved the desired volume, carefully transfer the solution to a 250ml volumetric flask using a funnel and rinse the beaker with a small amount of distilled water to ensure all solution is transferred.
6. Finally, fill the volumetric flask to the mark with distilled water to reach the final volume of 250ml. Make sure the bottom of the meniscus aligns with the mark on the flask.
Now, you have successfully prepared 10% ortho-phosphoric acid in a 250ml volumetric flask using the concentrated 85% ortho-phosphoric acid.
To prepare 10% ortho-phosphoric acid in a 250ml volumetric flask from 85% ortho-phosphoric acid, you will need to add the following amounts of each component:
- 85% ortho-phosphoric acid: 212.5ml
- Distilled water: 37.5ml
This will give you a total volume of 250ml and a concentration of 10% ortho-phosphoric acid.