1. 7th Grade Acids and Bases Review

2. Old Info Solution: a mixture of two or more substances
Solute: the substance that changes when a solution is prepared or is present in the smallest amount
Solvent: the substance that does not change when a solution is prepared or is present in the largest amount

3. Newer, but Still Old Info
Concentration: the ratio of the amount of solute to the volume of solvent, usually in mL
Dissociate: when a chemical compound is dissolved in a solvent and separates into two or more ions
Ion: a chemical compound that has a negative or a positive charge

4. What This Unit is All About...
Hydrogen ion H+
H atom that lost 1 electron
Nucleus and proton remain
Interacts readily with other
molecules → is very reactive
Hydroxide ion
OH-
Water molecule that has
lost a hydrogen ion, H+

5. Acids and Bases Acid: a chemical compound that
dissociates into a hydrogen ion
and a negatively charged ion when
mixed with water
Chemical that turns into H+
and something else in water
Base: a chemical compound that dissociates into hydroxide ion (OH-) and a positively charged ion when mixed with water
Chemical that turns into OH- and something else in water

6. More Acids and Bases pH scale: scale from 0 to 14 that is
a measure of the H+ concentration
LOGARITHMIC
Acids turn litmus paper RED
Bases turn litmus paper BLUE

7. Remember Our Labs…
Dilution: adding more solvent to a solution to make the solution less concentrated
Neutralization: when an acid and a base react to form a water molecule and reduce the hydrogen ion concentration