PH Scale.

Slides:



Advertisements
Similar presentations
PH The wonders of water!. Acids Any compound that GIVES OFF H+ ions in solution Any compound that GIVES OFF H+ ions in solution Ex. HCl H+ and Cl- Ex.
Advertisements

Indicators and pH Objective:
Acid and Base Reactions Unit 2 Chemistry. Common Acids  Occur naturally in fruits.  Produced by bacteria in milk (that is why milk turns sour).  Insects.
Acid and Base Academic Biology Mr. Luis A. Velazquez.
Aim: How to determine if a solution is acidic, basic, or neutral.
PH and Titration Notes Chemistry. pH  measure of the strength of acids and bases  pH = power of hydrogen  pH = -log [H + ]  logarithmic scale – so.
ACIDS AND BASES. Acids  Acidic solutions contain water and hydrogen ions (H+)
Indicators 1.Indicators are dyes which change colour when acidic or alkaline solutions are added to them. 2.Some common indicators are litmus, methyl orange,
Acids, Bases, and pH Chapter 9 Section 1.
ACIDS AND BASES. ACIDS & BASES Acids are substances that produce hydrogen ion in solution. (H + (aq) ) Bases are substances that produce hydroxide ions.
Acids, Bases, & ph Lab Page 101. Red cabbage waterRed cabbage water is an indicator of pH. Although it can't be used to determine exact pH, it can distinguish.
Acids & Bases. What are they? Acids & Bases An acid is any substance that releases H + ions in water.
Acids and Bases. A. Definitions 1. Acid releases hydrogen ions (H + ) 2. Bases release hydroxide ions (OH - ) 3. pH scale – measures how acidic or basic.
Acids and Bases PS-3.8 Classify various solutions as acids or bases according to their physical properties, chemical properties (including neutralization.
Solution Chemistry A solution is a homogeneous mixture where one substance dissolves another.
PSC 4012 Ionic Phenomena: A study of an environmental problem.
Delia, Lawrence, Jake, Will, Ashley, Rachel pH Monitoring.
Acid-Base Notes. Acid- Compound that forms hydrogen ions (H + ) when dissolved in water Base – compounds that forms hydroxide ion (OH - ) when dissolved.
pH Scale and Indicators
Chapter 6 Acids and Bases.
Acids & Bases I. Intro to Acids & Bases  Definitions  Properties  Uses.
Unit 5 Lesson 3 Measuring pH Copyright © Houghton Mifflin Harcourt Publishing Company.
Identification of Acids and Bases and pH Scale Science 10 Ms. McGrath.
Acids and Bases Applied Chemistry. Acids  Definition: A substance that produces hydrogen ions (H + or H +1 ) in water.  General reaction in water: HA.
Activity 46 Investigating Solutions of Acids and Bases You need:  Your book  Binder for notes  Goggles (for lab)
Acid Rain. What is acid rain? …precipitation with a pH below 5.6.
Aim: How to determine if a solution is acidic, basic, or neutral.
P in Prentice Hall Biology, Miller and Levine.
Acids & Bases solution with pH < 7 tastes sour react with bases turn litmus red solution with pH > 7 tastes bitter soapy texture (slippery feel) react.
Acid and Base Research Biology Mr. Luis A. Velázquez.
Acids & Bases Characteristics Examples solution with pH < 7
Acids and Bases.
Acids, Bases & Salts.
PH and Titration Notes Honors Chemistry.
pH Scale and Indicators
Aim: How to determine if a solution is acidic, basic, or neutral
PH scale “power of hydrogen”.
Acids and Bases.
Acids and Bases.
Describing Acids and Bases
Acids and bases F Acids and bases pH — measuring acidity
I. Intro to Acids & Bases Definitions Properties Uses
Acids and Bases Science 10.
Acids and Bases.
Acids produce H+ in solution,
Acids, Bases and Salts In this section we look at the properties of acids and bases, find out what salts are, and how to prepare them.
Chapter 5 Compounds are classified in different ways
Red Cabbage Indicator Year 7 Science.
Acids and Bases Chapter 23
Acids, Bases, & pH Section 2.6.
Do now Pollutants have the ability to cause the pH of a substance to change especially in aqueous solutions. Why do you think pH is related to water.
ACIDS A substance that produces HYDROGEN (H+) or HYDRONIUM (H3O+) ions in solution.
Chapter 7 – Acids, Bases and Solutions
PH scale A. A measurement system to indicate the concentration of H+ (hydrogen ions) 1. The pH scale ranges from Water is made up of H+ and OH-
Acids and Bases.
PH.
1.2 Acids & Bases.
I. Intro to Acids & Bases (p ) Definitions Properties Uses
Acids and Bases.
Chapter Nineteen: Solutions
Acids, Bases and Solutions
Day 14 – Identification of Acids and Bases and pH Scale
Test Wednesday/ Thursday
Acids and Bases.
The “p” stands for potential and the “H” stands for Hydrogen.
Acids and Bases.
Acids and Bases When water dissociates,
pH: Another Chemical Property
Chapter 4: Acids and Alkalis
Presentation transcript:

pH Scale

How do we measure the strength of acids and bases? pH: stands for the strength or concentration of hydrogen ions (H1+) in a solution.

pH Scale pH 7 is neutral. (Water) pH 1 is a very acidic. pH 13 is a very basic. pH 4 is 10 times stronger than pH 5 pH 3 is 100 times stronger than pH 5 Very Acidic Weakly Acidic Weakly Basic Very Basic Neutral

Very Acidic Very Basic Weakly Acidic Weakly Basic Neutral H+ H+ OH– Detergents Drain Cleaner Very Acidic Weakly Acidic Weakly Basic Very Basic Neutral Blood Ant Bites Stomach Acid Acid Rain H+ H+ OH– OH– H+ H+ OH– H+ H+ OH– H+ OH– OH– H+ OH– H+ H+ OH– OH– H+ OH– H+ OH– OH–

Many solutions of acids or bases are clear and colourless We use indicators to distinguish them from water, and tell whether a substance is acidic, basic or neutral There are many, many indicators, and each one has a different colour in acidic solutions versus basic solutions

Some Common indicators are: 1) Phenolphthalein drops (acid/neutral is clear, base is pink)

Some Common indicators are: Litmus paper – red litmus turns blue in base – Blue litmus turns red in acid

Some Common indicators are: 3) Universal pH paper – range of colours

Some Common indicators are: 4) Cabbage Juice – range of colours

Some Common indicators are: 5) pH meter – tells you exact pH

*When you’ve achieved the transition colours, show Mrs. Innes* Thymol blue Activity Instructions Put on your goggles and grab a test tube holder Get 3 test tubes, label HCl & NaOH & mixture Get 2 pipettes, label HCl & NaOH Get ½ a test tube of HCl and NaOH into appropriate test tubes. Add 2cm of HCl to mixture test tube. Add 3 drops of thymol blue to the mixture test tube Use only the appropriate test tube pipettes to add acid or base to get all the colours of the scale. *When you’ve achieved the transition colours, show Mrs. Innes*

The Importance of pH 1. The pH of environment effects plants and animals. ex. hydrangea flowers, frog or Fish survival Netural soils = white or pale petals Acidic soils = blue petals Basic soils = purple or pink petals.

2. The pH of your body affects your health 2. The pH of your body affects your health. If you are too acidic, yeast and bad bacteria can grow. Normal blood has a pH of 7.4, if pH falls below 6.8 or above 7.8 it is considered fatal.

3. Cosmetic/hair products with different pH’s have different effects 3. Cosmetic/hair products with different pH’s have different effects. Acidic ones make hair shiny and flexible. Basic ones make hair soft and straight.

Cabbage Lab