Question

Hi, I'm a little stuck on this problem:

Find the pH of the Hydrochloric acid solution when 5.0 mL of concentrated HCl, with a specific gravity of 1.18 and has 37% (w/w) purity is diluted to 2.0L

Answer 1

2L of what?

Answer 2

I assume you mean 2.0 L of solution with water.
What's the molarity of the 37% (first stuff)? That's
1.18g/mL x 1000 mL x 0.37% = g HCl
gHCl/molar mass HCl = moles HCl/L = M

Then use
c1v1 = c2v2
c1 = M from above
v1 = 5.0 mL
c2 = solve for this
v2 = 2000 mL.