Question

how do I prepare 0.5M hcl in 1l from conc hcl

Answer 1

How do I prepare 0.5M hcl in 1l from conc hcl

Solution

The 1l conc HCl (36.5% of HCl) is 11.8M. (d=1.18 g/cm³; Mᵣ=36.5 g/mol)

$$\mathrm{C_1V_1 = C_2V_2}$$

We want to prepare 1l 0.5M HCl => 0.5*1; and we have to take x l of 11.8M HCl.

$$x = \frac{0.5*1}{11.8} = 0.0424 \, \mathrm{l}.$$

So you have to take 0.0424l of conc HCl and 0.9576l of water.