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

MixturesWater pH

Honors Biology


Mixture

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

Types of Mixtures:

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


Parts of a solution

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 solution1

Parts of a Solution :

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

2. Solvent: the substance that does the dissolving.


B suspension

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

Now test what you learned:

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

Unknown #1:

Mixture

Salt & Pepper


Unknown 2

Unknown #2:

  • Saltwater:

Solution

Solute:

Salt

Solvent:

Water


Unknown 3

Unknown #3:

Solution

Solute:

Sugar

Solvent:

Lemon Juice


Unknown 4

Unknown #4:

Muddy Water

Suspension


Unknown 5

Unknown #5:

Solution

Solute:

Chocolate

Solvent:

Milk


Unknown 6

Unknown #6:

Kool-Aid

Solution

Solute:

Kool-Aid

Solvent:

Water


Special type of solution

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: 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 life1

Water: Needed for Life

  • This polarity gives us the property of Hydrogen Bonding.


Water needed for life2

Water: Needed for Life

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


Water cohesion

Water: Cohesion

Cohesion is the ability for water molecules to stick to themselves

Surface Tension

Beads of Water


Water adhesion

Water: Adhesion

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

Meniscus in a graduated cylinder


Water a great solvent

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

pH: What is it?

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


Ph what is it1

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 it2

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

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

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

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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