1 / 26

Mixtures Water pH

Mixtures Water pH. Honors Biology. Mixture:. A combination of two or more substances that are physically mixed They are not chemically combined!! Examples : soil, salsa, trail mix, milk & cereal, sugar water. Types of Mixtures:.

feleti
Télécharger la présentation

Mixtures Water pH

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MixturesWater pH Honors Biology

  2. Mixture: • A combination of two or more substances that are physically mixed They are not chemically combined!! • Examples:soil, salsa, trail mix, milk & cereal, sugar water.

  3. Types of Mixtures: • A. Solution: A mixture formed when one substance dissolves in another- molecules are evenly distributed.

  4. Parts of a Solution : 1. Solute: the substance that is dissolved in a solution 2. Solvent: the substance that does the dissolving. Example: salt water solute=salt, solvent=water

  5. Parts of a Solution : 1. Solute: the substance that is dissolved in a solution 2. Solvent: the substance that does the dissolving.

  6. B. Suspension: • Mixture of water and non-dissolved materials (In between a Mixture and Solution) • A Colloid: A suspension where you can’t see materials with naked eye • Examples: Blood, Milk

  7. Now test what you learned: • Indicate whether each is a mixture, solution or suspension. Unknown #1: Mixture Salt & Pepper

  8. Unknown #2: • Saltwater: Solution Solute: Salt Solvent: Water

  9. Unknown #3: Solution Solute: Sugar Solvent: Lemon Juice

  10. Unknown #4: Muddy Water Suspension

  11. Unknown #5: Solution Solute: Chocolate Solvent: Milk

  12. Unknown #6: Kool-Aid Solution Solute: Kool-Aid Solvent: Water

  13. Special Type of Solution • Emulsion – a type of Colloid An emulsion is a suspension of two liquids that usually do not mix together. For example if we mix oil and water a suspension will form that over time separates. But now, if we add a few drops of a third substance, the emulsifier, and shake the mixture the oil and water will stay mixed much longer. Examples of emulsions include butter and margarine, and mayonnaise.

  14. Water: Needed for Life • Water has several properties that make it necessary for life. • It is POLAR - It has area with a slight positive charge, and an area with a slight negative charge.

  15. Water: Needed for Life • This polarity gives us the property of Hydrogen Bonding.

  16. Water: Needed for Life Hydrogen Bonding allows one water molecule to “stick” to another water molecule.

  17. Water: Cohesion Cohesion is the ability for water molecules to stick to themselves Surface Tension Beads of Water

  18. Water: Adhesion Adhesion is the ability for water molecules to stick to other materials Meniscus in a graduated cylinder

  19. Water: A Great Solvent Remember… A solvent has the ability to dissolve other materials • Water is a solvent for many things • For example: The liquid part of your blood (the plasma) is 90% water • Some items, such as fats and oils DO NOT dissolve in water.

  20. pH: What is it? The pH scale is used to measure the strength of acids and bases

  21. pH: What is it? • Some compounds break up into ions when they dissolve in water. • Solutions with more H+ ions are more ACIDIC • They have a LOW pH (<7) • Solutions with less H+ ions are more BASIC • They have a HIGH pH (>7)  H2OH+ + OH- 

  22. pH: What is it? Some properties of acids and bases Lemon vinegar soda, aspirin Sour, burns, dissolves things < 7 Pure Water ------ = 7 Soap, baking soda, ammonia > 7 Bitter, Slippery

  23. pH: Looking at common items Battery Acid pH = 0 Orange Juice pH = 3 Ocean Water pH = 8 Oven Cleaner pH = 13

  24. pH: Importance to Humans • Blood has a pH of 7.4 (about neutral) • If pH goes below 6.8 or above 7.8 it is deadly! • To keep blood at the proper pH - our body uses buffers

  25. pH: Buffers • Buffers are weak acids or bases that neutralize, or weaken, strong acids or bases. • In blood, buffers prevent pH change. • Sodium bicarbonate, or baking soda, is a buffer

More Related