Water & pH Do Now: OBJECTIVES: Define pH and the pH scale.

Slides:

Advertisements

Similar presentations

Acids and Bases. Think back to a time when you have eaten something very sour… Think back to a time when you have eaten something very bitter… What were.

Advertisements

Water & pH Do Now: What are the special properties of water we discussed last week, and what’s so special about them anyway? Make a prediction: place the.

Calculating pH and pOH. pH pH = - log [H + ] [H + ] = the hydrogen ion concentration pH: “potential of hydrogen” - A way of expressing the hydrogen ion.

Solutions Acids and Bases. Solutions A solution is a mixture in which one or more substances are uniformly distributed in another substance. (Liquids,

Acids and Bases. Properties of Acids: Properties of ACIDS: 1. tastes sour.

PH Scale Standard: 5d-students know how to use the pH scale to characterize acid and base solutions.

MIXTURES AND SOLUTIONS. MIXTURE a combination of substances in which the individual components retain their own properties. a combination of substances.

Acids, Bases & pH. What are Acids? Acids taste SOUR –Lemons, vinegar Compounds that have Hydrogen (H + ) as their cation. Examples: –HCl – Hydrochloric.

Water & pH Do Now: Draw a sketch of three water molecules that are hydrogen bonded together.

Acids burn.. Bases burn. VI. Strength of Acids and Bases A. Strong acids and bases… 1. completely dissociate (come apart) or ionizes  100% of the molecules.

Section 6.3—Acidity, pH Objectives

 Bonds of Water- strong › Can break into hydrogen ion (H + ) and hydroxide ion (OH - ) H 2 O  H + + OH -

Acids and Bases. Properties of Acids þ Produce H + (hydrogen) ions in water þ Taste sour þ Corrode metals þ React with bases to form a salt and water.

Acids / Bases Foster ESS Study this for the Quiz.

7 th grade science What is pH?. Some of our favorite foods make our tongue curl up because they are SOUR. Some of our favorite foods make our tongue curl.

Acids and Bases The pH scale What do vinegar, lemons, and orange juice have in common?

Acids and Bases They don’t blow up in your faces!.

Acids and Bases Acids and Bases. Acids Have a sour taste. Vinegar is a solution of acetic acid. Citrus fruits contain citric acid. React with certain.

Figure Water is Central to Life Water has several properties that life is dependent upon including: Cohesion High heat of vaporization High specific.

Structure of Water H & O covalently bonded together. H & O covalently bonded together. Water is polar Water is polar It has a slightly positive charge.

Acid-Base Notes. Acid- Compound that forms hydrogen ions (H + ) when dissolved in water Base – compounds that forms hydroxide ion (OH - ) when dissolved.

ACIDS AND BASES PH.

Acid Base Chemistry. Acids Taste sour conduct electricity react with zinc or magnesium to produce hydrogen gas turn blue litmus paper red.

- the basic idea that scientists went with for acids and bases was that acidic properties were related to the presence of hydrogen ions and basic properties.

1 4.7 Acids and Bases. Properties of Acids and Bases Acid Base - pH 7 - tastes sour- tastes bitter - no special feel- feels slippery - turns blue litmus.

NOTES: 19.2 – Hydrogen Ions & Acidity (pH and pOH)

Science Survey ACIDS AND BASES. ACIDS Acids donate H+ ions to form hydronium ions, H when dissolved in water. Acids have a pH of less than 7. pH=

Properties of Acids and Bases Chapter 6. Acids, Bases, and pH 1. When a water molecule is separated, it separates into two ions 2. Ions are slightly charged.

Acids and Bases SPS6. Students will investigate the properties of solutions. d. Compare and contrast the components and properties of acids and bases.

ACIDS & BASES An Overview. Acids A compound that produces hydrogen ions (H+) when dissolved in water. Properties include sour taste, reactivity with metals,

Acids and Bases.

Acids, Bases, and pH.

Ready Acids and Bases.

Acids and Bases--pH.

The pH Scale Hydronium & Hydroxide Ions (H3O+) (OH–) pH Scale

Chapter 14 & 15.1 Acids, Bases, and pH

Acids, Bases, & pH.

Acids/Bases Svante Arrhenius, a Swedish chemist, proposed the following definition: Acids form hydronium ions in aqueous solutions, while bases form hydroxide.

8.3 Properties of Acids and Bases

Self Ionization of Water and the pH Scale

Acids and Bases.

Acids and Bases To play the movies and simulations included, view the presentation in Slide Show Mode.

8.3 Properties of Acids and Bases

Acids and Bases SPS6. Students will investigate the properties of solutions. d. Compare and contrast the components and properties of acids and bases.

The pH Scale Hydronium & Hydroxide Ions (H3O+) (OH–) pH Scale

On a Scale of 0 to 14 pH Notes.

Unit 14 – Acid, Bases, & Salts

Unit 13 – Acid, Bases, & Salts

Acids and Bases.

Acids and Bases pH factor.

2.4 The pH Scale: Acids and Bases

Chapter 7 – Acids, Bases and Solutions

Warm Up Take out your notes and practice problems on Types of reactions. Review and get ready for a quiz.

Acids and Bases To play the movies and simulations included, view the presentation in Slide Show Mode.

Acids and Bases.

Unit 13 – Acid, Bases, & Salts

Calculating pH and pOH.

Acids and Bases pH factor.

copyright cmassengale

Acids and Bases.

Calculating pH (and pOH)

Physical Science Chapter 23

Unit 15 – Acid, Bases, & Salts

Identification and Properties

Unit 13 – Acid, Bases, & Salts

Unit 14 – Acid, Bases, & Salts

Water and Solutions Chapter 6.3 pgs

Solutions and pH Chapter 2.

Unit 13 – Acid, Bases, & Salts

Presentation transcript:

Water & pH Do Now: 11.16 OBJECTIVES: Define pH and the pH scale. TASK: 1. List the 4 special properties of water we saw recently. 2. Make a prediction: place the following in order from the MOST acidic to the LEAST acidic: Water, Soda, Coffee, Soapy water

Dissociation of Water – At any point in time, 1 in 10,000,000 water molecules split into H+ and OH-

pH scale: A before B

pH of Solutions… What is it? What does it mean to be “acidic?”

pH Measures the Concentration of H+ ions More H+  More acidic  Lower pH More OH-  More basic  Higher pH But it’s not a linear scale…

Arrhenius Acids & Bases Acid: A substance which produces H+ when dissolved in water. Base: A substance which produces –OH when dissolved in water.

pH measures H+ ACIDS BASES Low pH High pH Lots of H+ Little H+ Little -OH Lots of -OH Taste sour (e.g. lemon juice, vinegar) Feel soapy (e.g. bleach)

Can You Spot the Patterns? Concentration of H+ (mol/L) Concentration of OH- (mol/L) pH .000,000,000,001 (10-12) .01 (10-2) 12 .000,000,000,01 (10-11) .001 (10-3) 11 .000,000,000,1 (10-10) .000,1 (10-4) 10 .000,000,001 (10-9) .000,01 (10-5) 9 .000,000,01 (10-8) .000,001 (10-6) 8 .000,000,1 (10-7) 7 6 5 4 3 2

Quick Math Refresher What is a logarithm Quick Math Refresher What is a logarithm? It’s the opposite of an exponent. Log10 100 = 2 What’s the relationship?

The pH scale is logarithmic pH = -log [H+] [H+] = concentration of H+ in mol / L Examples: Neutral water: [H+] = 10-7 mol/L -log 10-7 = 7 Vinegar: [H+] = 10-3 mol/L -log 10-3 = 3 Notice: Even though there is10,000 times as much [H+] in the vinegar the pH is different by 4. A change of 1 unit on the pH scale indicates a 10x change in ion concentration!

A Word About Hydrogen Ions and Hydronium H+ is a proton. In solution, H+ is always stuck to a water molecule (which part?) Therefore, the following terms are all refer to what there is more of in an acid : protons H+ Hydronium

Hydroxide and hydronium Hydronium = H3O+. When extra H+ is put into a solution, it sticks to water to make this. Hydroxide = -OH.