250 mL 0.1 M HCl solution is mixed with 250 mL 0.2 M NaOH. The concentration of OH- in the
mixture is

The concentration of OH⁻ in the mixture is 0.05 M

Explanation:

The reaction of neutralization between HCl and NaOH is the following:

H⁺(aq) + OH⁻(aq) ⇄  H₂O(l)

The number of moles of HCl is:

Similarly, the number of moles of NaOH is:

Now, from the reaction of HCl and NaOH we have the following number of moles of NaOH remaining:

Finally, the concentration of OH⁻ in the mixture is:

Therefore, the concentration of OH⁻ in the mixture is 0.05 M.

I hope it helps you!

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6