A. the concentration of oh- ions in a sample of seawater is 5.0 x 10-6m. calculate the concentration of h+ ions and determine the ph and poh of this solution. is it neutral, acidic, or basic? b. the concentration of h+ ions in a sample of lemon juice is 2.5 x 10-3m. calculate the concentration of oh- ions and determine the ph and poh of this solution. is it neutral, acidic, or basic?

To solve this problem we need to keep in mind the definitions of pH and pOH:

a. [OH⁻] = 5.0 x 10⁻⁶ M

With that value we can calculate pOH:

With pOH we calculate pH:

With pH we calculate [H⁺]:

The pH in the sample is higher than 7.0, so it is basic.

b. [H⁺] = 2.5 x 10⁻³ M

With that value we can calculate pH:

With pH we calculate pOH:

With pOH we calculate [OH⁻]:

The pH in the sample is lower than 7.0, so it is acid.

the answer is barium and copper bromide

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b