Unit Test Answers

An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water:Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation?

Several substances are labeled on the pH scale below.Which substance has the lowest [H+] concentration but is still considered an acid?

How does litmus paper identify a base?

A substance is dissolved in water and produces hydronium ions. This occurs when hydrogen ions move from the substance to associate with water molecules. Which term best matches the behavior of this substance?

Why is citric acid added to food?

Which characteristic best identifies an Arrhenius base?

An unknown substance turns methyl orange solution red. This shows that the substance

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of ions in the solution? Use .

Four different solutions (I, II, III, and IV) are labeled on the pH scale below.Why would solution IV be considered the most concentrated base out of the four substances?

A compound accepts electrons from another substance to form a covalent bond. Which term best describes this compound’s behavior?

Which of these equations correctly expresses the self-ionization of water?

What is the Arrhenius definition of a base?