How much of a 2.0 M NaCl solution is needed to make 205.0 mL of 0.15 M NaCl solution?

To relate the volume and molarity of a solution at two different concentrations, the expression used is :

M₁V₁ = M₂V₂

(2M) V₁ = (0.15M)(250ML)

V₁ = 18.75

step 3:

the answer is a. co2, this would be colder than the : )

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.