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.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.