Mixtures water ph
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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:.

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Mixtures Water pH

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MixturesWater 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:

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


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


Parts of a Solution :

1. Solute: the substance that is dissolved in a solution

2. Solvent: the substance that does the dissolving.


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


Now test what you learned:

  • Indicate whether each is a mixture, solution or suspension.

Unknown #1:

Mixture

Salt & Pepper


Unknown #2:

  • Saltwater:

Solution

Solute:

Salt

Solvent:

Water


Unknown #3:

Solution

Solute:

Sugar

Solvent:

Lemon Juice


Unknown #4:

Muddy Water

Suspension


Unknown #5:

Solution

Solute:

Chocolate

Solvent:

Milk


Unknown #6:

Kool-Aid

Solution

Solute:

Kool-Aid

Solvent:

Water


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.


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.


Water: Needed for Life

  • This polarity gives us the property of Hydrogen Bonding.


Water: Needed for Life

Hydrogen Bonding allows one water molecule to “stick” to another water molecule.


Water: Cohesion

Cohesion is the ability for water molecules to stick to themselves

Surface Tension

Beads of Water


Water: Adhesion

Adhesion is the ability for water molecules to stick to other materials

Meniscus in a graduated cylinder


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.


pH: What is it?

The pH scale is used to measure the strength of acids and bases


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-


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


pH: Looking at common items

Battery Acid

pH = 0

Orange Juice

pH = 3

Ocean Water

pH = 8

Oven Cleaner

pH = 13


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


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


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