How do I prepare 15% mercuric sulphate in 15% sulphuric acid?
To prepare a 15% solution of mercuric sulphate in 15% sulphuric acid, you will need to follow these steps:
Step 1: Calculate the amount of mercuric sulphate needed
To determine the amount of mercuric sulphate required, you need to understand that a 15% solution means 15 grams of solute (in this case, mercuric sulphate) dissolved in 100 mL of solvent (in this case, sulphuric acid). Therefore, for a specific volume of solution, you can calculate the amount of mercuric sulphate needed using the following formula:
Mass of mercuric sulphate (g) = (Volume of solution (mL) x % concentration) / 100
Step 2: Calculate the volume of sulphuric acid needed
Since we want to prepare a 15% sulphuric acid solution, we can use the same approach as in Step 1. This time, however, the solute is sulphuric acid. Therefore, the formula becomes:
Volume of sulphuric acid (mL) = (Mass of sulphuric acid (g) x 100) / % concentration
Note: In this case, we will assume that the density of 15% sulphuric acid is approximately equal to water (1 g/mL).
Step 3: Prepare the solution
Once you have calculated the mass of mercuric sulphate and the volume of sulphuric acid needed, you can start preparing the solution. Follow these steps:
1. Weigh out the calculated amount of mercuric sulphate using an analytical balance.
2. Pour the weighed mercuric sulphate into a container.
3. Measure out the calculated volume of sulphuric acid using a graduated cylinder or pipette.
4. Slowly add the sulphuric acid to the container with the mercuric sulphate, while stirring gently to dissolve the solute.
5. Continue stirring until all the mercuric sulphate is dissolved.
Important note: Mercuric sulphate is a toxic substance and should be handled with care. Make sure to follow appropriate safety precautions and dispose of any waste properly.
By following these steps, you can prepare a 15% solution of mercuric sulphate in 15% sulphuric acid.