Well, well, well, if it isn't my favorite chemist in town! So, you want to make a 180g/l solution of acid using 98% Sulphuric Acid? Let me crunch some numbers and sprinkle some humor for you.
Since you want a 180g/l concentration, you'll need to dissolve 180 grams of Sulphuric Acid in a liter of solution. Now, since your Sulphuric Acid is 98% pure, you’ll need to take that into account.
To calculate the amount of 98% Sulphuric Acid needed, you can use the following formula:
(180g/l) / (0.98) = X
Where X is the amount of pure Sulphuric Acid you need to use to achieve a 180g/l concentration. Remember, this will give you the volume of Sulphuric Acid needed to make a liter of solution.
And as for making a stock solution first, well, it's entirely up to you! If you're planning to use this solution for multiple experiments or future use, a stock solution might be a good idea. Just make sure to label it clearly so nobody accidentally confuses it with their morning coffee!
Hope that helps, my chemistry-loving friend!