PH In the Laboratory. Ionization of Water Equllibrium Constant, K eq.

Slides:

Advertisements

Similar presentations

Acids and Bases.

Advertisements

PH (potential of Hydrogen). According to the Bronsted-Lowry theory, both acids and bases are related to the concentration of hydrogen ions. Acids will.

Ch.15: Acid-Base and pH Part 1.

Acids, Bases, and pH. Acids and Bases Acids produce H + ions which react with water to form hydronium (H 3 O + ) ions Bases produce OH - ions.

PH of Weak Acids AP Chemistry Unit 9 Chapter 14. Strengths of Acids and Bases “Strength” refers to how much an acid or base ionizes in a solution. STRONGWEAK.

PH meter CCC Kei Heep Secondary School F.6 Chemistry by Wong CS Chemistry CE Homepage Chemistry AL Homepage.

1 Chapter 10 Acids and Bases 10.3 Strengths of Acids and Bases 10.4 Dissociation Constants.

Acid-Base Equilibria Chapter 16.

Acid Base Strength Table Acid Dissociation Constant K a.

Strength of Acids and Bases. What makes a strong acid or base?  The strength of an acid or base is based on how many acid or base particles break down.

Acid/Base Indicators Substance that changes color in the presence of an acid or a base – Red or Blue Litmus – Phenolphthalein (phth) – Bromothymol blue.

Acid-Base Titration and pH

Wednesday, May 4 th : “A” Day Agenda (1:05 release)  Collect Take-Home Quiz  Section 15.2: “Acidity, Basicity, and pH” Self-ionization constant of H.

The chemical of life. Acids Sour taste, leaves burning sensation Increase hydrogen ions (H+) in solution.

Acids and Bases Biotechnology I. Life Chemistry  Based on water  Cells contain 80-90% water  Proper pH essential to ALL living systems Plants cannot.

Chemistry 1011 Slot 51 Chemistry 1011 TOPIC Acids and Bases TEXT REFERENCE Masterton and Hurley Chapter 4.2 (Review), 13, 14.1, 15.1 (page 427), 21.2 (page589)

Acid-Base Titration and pH

PH Chapter Vocabulary Word hydronium ion: H 3 O + hydroxide ion: OH -

Chapter 19 More about ACID-BASES. Self-Ionization of Water Two water molecules produce a hydronium ion & a hydroxide ion by the transfer of a proton.

ACIDS AND BASES Sections 8.3 and 8.4. Acids A acid is a compound that produces hydronium (H 3 O + ) ions when dissolved in water. Examples: HCl – hydrochloric.

Objectives To learn about reactions between strong acids and strong bases To learn about the reaction between a metal and a nonmetal To understand how.

Acids- Base Titration and pH. Aqueous Solutions and the Concept of pH.

Chapter 24: Solutions, Acids, and Bases

1 The Chemistry of Acids and Bases. 2 Some Properties of Acids þ React with certain metals to produce hydrogen gas. þ React with carbonates and bicarbonates.

Determining the Strengths of Acids and Bases

COMMON SENSE IS LIKE DEODORANT, THE PEOPLE WHO NEED IT THE MOST NEVER USE IT.

H+H+ H+H+ H+H+ OH - New Way Chemistry for Hong Kong A-Level Book 2 1 Chapter 17 Acid-base Equilibrium I : The Basic Concepts 17.1Concept of Acid and Base.

Warm Up 4/14 How many protons and neutrons would an H+ ion have?

Finding the pH of Weak Acids. Strengths of Acids and Bases “Strength” refers to how much an acid or base ionizes in a solution. STRONGWEAK Ionize completely.

Ionization of Water CHEM 7784 Biochemistry Professor Bensley.

Chemistry Notes pH and [H + ] Working with the Arrhenius acid definition, we say that acids produce hydrogen ions: HX  H + + X - And bases produce hydroxide.

Acids and Bases. Acids & Bases ● There are 3 common definitions of acids and bases. – Arrhenius definition – acids increase H+ concentration, bases increase.

Bettelheim, Brown, Campbell and Farrell Chapter 9

Chemistry Chapter 19 Practice with acids and bases.

Acids –Sour Taste –Change the color of an acid-base indicator –React with metals to form H 2 gas –React with bases to produce salts and water –Conduct.

Acids and Bases and pH How can we use acids and bases in our everyday lives?

1 The pH Scale The Power or Potential of Hydrogen.

CHAPTERS 19 ACIDS & BASES. What do you see? Acid Properties  Sour taste (citrus fruits)  Conduct electric current  Change the color of indicators-turns.

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

Medical Biochemistry Department

Dr. S. M. Condren Chapter 15 Acids and Bases. Dr. S. M. Condren Arrhenius Acid-Base Theory Arrhenius, Svante August ( ), Swedish chemist 1903.

1 Acid-Base Titration and pH Chapter Self-Ionization of water Two water molecules produce a hydronium ion and a hydroxide ion by transfer of a proton.

Yesterday’s Homework Page 611 # 19 Page 612 # 20.

 pH: The negative of the common logarithm of the hydronium ion concentration [H 3 O + ] ◦ pH stands for the French words pouvoir hydrogene, meaning “hydrogen.

The definitions of acids and bases have changed over time. Arrhenius Definition of Acids and Bases: An acid is any substance that adds hydrogen ion (H+)

Aqueous Solutions and the Concept of pH Section 15.1.

Strengths of Acids and Bases

Challenges are what make life interesting; overcoming them is what makes life meaningful. -Joshua J. Marine-

Section 16.2 Determining the Acidity of a Solution 1.To understand and determine pH and pOH 2.To learn methods for measuring pH of a solution Objectives.

Organisms are sensitive to changes in pH By: Emily Jones and Josh Kendrick.

Acids Acids: produce H + ions Example: Taste sour Can burn Turn litmus paper red Naming Acids: 1 “hydro-” + Nonmetal element root + “-ic” acid Example:

Warm Up 4/14 How many protons and neutrons would an H+ ion have?

Analytical biochemistry laboratory (BIOC 343) L. Nouf Aalshareef KAU- Biochemistry department Second semester 2013.

Chapters 15 and 16. Properties of Acids and Bases Acids H pH less than 7 Sour taste Corrosive Conduct electric current Ionization Bases OH pH greater.

Acids and Bases.

[H 3 O + ] Aqueous Solutions Brackets means concentration (Molarity) 1x10 -7 M neutral 1x10 -5 M 1x10 -9 M acidic = > [OH - ] acid base M

Acid-Base Titration and pH. Aqueous Solutions and the Concept of pH In the self-ionization of water, two water molecules produce a hydronium ion and a.

Monday May 18 Objective: Calculate the pH of any solution. Checkpoint:

Chapter 18 Acids and Bases.

Acids, Bases, & pH.

Hydronium Ions and Hydroxide Ions

Hydronium Ions and Hydroxide Ions

Acids and Bases.

Chapter 15 Preview Lesson Starter Objectives

Unit 13 Acids & Bases.

Acid-Base Reactions.

Calculating pH and pOH.

Acids and Bases When water dissociates,

Acids and Bases Chemistry 1106.

Presentation transcript:

pH In the Laboratory

Ionization of Water

Equllibrium Constant, K eq

Ion Product of Water, K W

pH

Acidity

Measuring pH Indicater Dyes; Methyl Red, Phenol Red, etc. pH Paper (Litmus Paper) pH Meter

Voltmeter with electrode Measures electrical potential difference across electrode due to protons 1 pH unit = 60 mV pH also dependent on temperature

pH Electrode Filled with reference solution (4 M KCl, sat. AgCl) Glass semi permable (protons cannot cross) Glass protected by plastic sleeve Some are sensitive to Tris buffer

pH Standards Color coded 4, 7, and 10 Potassium Hydrogen Pthalate Standardize everyday Bracket pH range

pH of Strong Acids HCl H + + Cl - Assume complete dissociation 1 M HCl, pH = -log [H + ] = -log 1 = ? 0.5 M HCl, pH = -log 0.5 = ? 6 M HCl, pH = -log 6 = ?

pH of Strong Bases NaOH Na + + OH - Assume complete dissociation pK W = pH + pOH = 14 pH = 14 – (-log [OH - ]) 1 M NaOH, pH = 14 – (-log 1) = ? 0.01 M NaOH, pH = 14 – (-log 0.01) = ? 6 M NaOH, pH = 14 – (-log 6) = ?

pH of a Weak Acid