SORRY ADD ON TO MY PREVIOUS QUESTION. I ALSO NEED TO WORK OUT THE PH OF THE SULFURIC ACID SOLUTION.

http://www.jiskha.com/search/search.cgi?query=21g

To work out the pH of a sulfuric acid solution, you need to know the concentration of the acid. The concentration is usually given in moles per liter (M). Since you have provided the mass of sulfuric acid (21g), we need to convert this to moles and know the volume of the solution to calculate the concentration.

The molar mass of sulfuric acid (H2SO4) is:
(2 x 1.01 g/mol) + (32.07 g/mol) + (4 x 16.00 g/mol) = 98.09 g/mol

To convert the mass of sulfuric acid to moles, divide the mass by the molar mass:
21g / 98.09 g/mol = 0.21 mol

Now, if you provide the volume of the sulfuric acid solution in liters, we can determine its concentration (M). With the concentration, we can proceed to calculate the pH of the solution.

Please provide the volume of the sulfuric acid solution in liters.