A 20.0-mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added.

a. 20ml
b. 22mL
c. 24ml
d. 27ml
e. 29mL.

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Nonpoint source pollution is difficult to control because it

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?