Asolution has a ph of 5.4. write the formula you will use to calculate the (h+)

3.981 x 10⁻⁶.

Explanation:

∵ pH = - log[H⁺]

∴ 5.4 = - log[H⁺]

∴ log[H⁺] = - 5.4

∴ [H⁺] = 3.981 x 10⁻⁶.

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.