Oh dear, you should really be specific as to what volume of acid you want to prepare, and more importantly, the strength of the acid already available to you.
Let’s consider the concentrated HNO3 found generally in labs (70%, normality- 15.8)
In order to make 1L of 0.5(N) acid, you would want about 31.7ml of it.
for other concentrations/volumes please calculate using the V1S1=V2S2 formula.
To prepare 1 L of 0.5 N HCl solution, you have to take 0.5 gram equivalent of pure HCl.
1 gram equivalent of HCl = 1 mole of HCl.
So, 0.5 gram equivalent HCl = 0.5 mole HCl = (0.5 x 36.5) gram HCl = 18.25 g HCl.
Take 1 L volumetric flask. Pour 18.5 g HCl in it. Add distilled water with shaking, make up the volume upto 1L mark. Your desired solution is ready. :)
Hope it helps <3
Percentage composition of elements is determined by using formula :-