Acids

1
Acids Bases The pH Scale
2
What is a solution?

• A mixture containing more than 1substance
• Examples

3
Whats in a solution?

• Solute
• Substance that is dissolved in the solution
• Solvent
• What the solute is dissolved in
• For example, in a salt water solution the salt is
  the solute and the water is the solvent
• Water is the UNIVERSAL SOLVENT!

4
What are some types of solutions?

• Your body contains lots of solutions too!
• Blood
• Saliva
• Stomach fluid
• Urine
• Different solutions have different
  characteristics so they are used for different
  things
• 3 Major Types
• Neutral
• Acidic
• Basic/Alkaline

5
What is the pH scale?

• A scale that measures the acidy or alkalinity of
  a substance
• The scale goes from 0 to 14
• 7 marks a NEUTRAL solution
• lt 7 marks an ACIDIC solution
• gt 7 marks a BASIC / ALKALINE solution

6
What are the properties of a NEUTRAL solution?

• pH 7
• Equal amount of hydrogen ions (H) and hydroxide
  ions (OH-)
• Example WATER!
• Keeps balance in your body
• 2/3 of your body weight is water

7
What are the properties of an ACIDIC solution?

• pH below 7
• 0-6.9
• Characteristics
• Sour taste
• Conduct electricity
• Break down substances (corrosive)
• Examples
• Citrus fruits
• Battery acid
• Phosphoric acid in pop

8
What are the properties of a BASIC / ALKALINE
solution?

• pH above 7
• 7.1-14
• Characteristics
• Bitter taste
• Slippery to touch
• Break down substances (cleans)
• Examples
• Soaps
• Cleaning supplies
• Laxatives

9
What are buffers?

• Solutions that RESIST a change in pH
• Keep adding acid or base, but the pH doesnt
  change!
• VERY important in the body
• Help keep the pH levels in your body constant

10
What is ?

• pH is measured using ROY G BV
• ROY Acid
• G Neutral
• BV Base/Alkaline

ROY G BV
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• Now its time to write a summary! Write 3
  sentences that briefly describe the topic just
  discussed!