Solutions - mixture of 2 or more substances in which the molecules of the substance are evenly distributed (chemically combine). Solute is the substance that is dissolved (e.g., sugar) Solvent is the substance in which the solute dissolves (what does the dissolving), (e.g., water) Water is the greatest solvent on Earth.
Suspensions - are material that do not dissolve in water Example: sand & water, Italian dressing (oil floats to the top)
Acids release hydrogen ions (H + ) when dissolved in water. The more H + a substance releases, the more acidic the solution becomes. Many of the foods and beverages we eat and drink are acidic. The substances in the stomach that break down the food are highly acidic.
Bases release hydroxide ions (OH - ) when dissolved in water. The more OH - a substance releases, the more basic the solution becomes.
pH scale indicates the concentration of H + ions in a solution. The more H + in a solution, the lower the pH is, and the more acidic it is.
pH below 7 are acidic, they have more H + ions than they have OH - pH above 7 are basic, they have more OH - ions than they have H + A pH of 7 is neutral, they have the same amount of H + & OH - ions; water is neutral