U2 S2 L4 Ka and Kb calculations p 587-591: pH and Ka of a Weak Acid p 592-594: The Base Dissociation Constant, Kb Homework: p 591: # 5, 6, 7, 8, 9 and.

Slides:

Advertisements

Similar presentations

8.2 – Equilibrium of Weak Acids and Bases

Advertisements

Acids and Bases.

Aqueous solutions & concepts of pH Chapter I. Ion Product constant - water A.  Acids→ hydronium ions (H 3 O+)  Bases → hydroxide ions (OH-) B.Self.

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

Ka and Kb Calculations. For Weak Acid Reactions: HA + H 2 O  H 3 O + + A - K a = [H 3 O + ][A - ] K a < 1 [HA]

ACIDS AND BASES Dissociation Constants. weaker the acid, the stronger its conjugate base stronger the acid, the weaker its conjugate base.

Acids and Bases Chapter and Br Ø nstead Acids and Br Ø nstead Bases Recall from chapter 4: Recall from chapter 4: –Br Ø nstead Acid-

Relationship Between Ka and Kb. Consider the dissociation of a weak acid: CH 3 COOH (aq) + H 2 O (l)  H 3 O + (aq) + CH 3 COO - (aq) K a = [H 3 O + ][CH.

Modern Chemistry Chapter 15 Acid-Base Titration and pH

8.2 Strong and Weak Acids and Bases

The Ion Product Constant for Water (Kw)

1 Electrolytic dissociation of water The water molecules dissociates according to the reaction: H 2 O + H 2 O H 3 O + + HO - The equilibrium is shifted.

T HE A CID D ISSOCIATION C ONSTANT, K A. T HE A CID D ISSOCIATION C ONSTANT When a weak acid dissolves in water, it does not completely dissociate. The.

K sp, K a and K b.  Much like with a system of equations, a solution is also an equilibrium  NaCl(aq)  Na + (aq) + Cl - (aq)  The ions in this solution.

Unit 5: Acids & Bases Lesson 4

Noorulnajwa Diyana Yaacob

Self-ionization of water

Calculations Involving Acids and Bases IB Chemistry Power Points Topic 18 Acids and Bases

SCH 4U.  Ionize only partially in water, exist primarily in molecule form  Dynamic equilibrium established between unreacted molecules and ions formed.

pH and Ka values of Weak Acids

Weak Acids & Weak Bases. Review Try the next two questions to see what you remember Try the next two questions to see what you remember.

GSCI 163 Lecture 10.

Here, we’ll show you how to calculate the pH and % ionization of a weak acid with a given concentration and a known Ka value. K a to pH and Percent Ionization.

Acids and Bases Calculating Excess. Calculations involving strong acids and bases During an experiment, a student pours 25.0 mL of 1.40 mol/L nitric acid.

Equilibrium. Chemical Equilibrium Review Most chemical reactions do not go to completion. They appear to stop. These reactions are reversible A chemical.

Chapter 1611 Strong Acids The strongest common acids are HCl, HBr, HI, HNO 3, HClO 3, HClO 4, and H 2 SO 4 Strong electrolytes Ionize completely in solution:

Acid Base Equilibrium Weak Acids & Bases. Recall From Yesterday…. pH = -log [H 3 O + ] [H 3 O + ] = 10 -pH pOH = -log [OH - ] [OH - ] = 10 -pH pK w =

The Equilibrium of Weak Acids and Bases. The dissociation of an acidic or basic compound in aqueous solution produces ions that interact with water (REVIEW!)

Buffer or Common Ion problems. Identify the weak acid or base in the problem. There has to be one or the other to create a buffer. Write the ionization.

Weak acid and base calculations. What’s so hard? Unlike strong acids and bases, weak examples do not dissociate fully. For example, a 1 molL -1 HCl solution.

8.3 Bases Similar to weak acids, weak bases react with water to a solution of ions at equilibrium. The general equation is: B(aq) + H2O(l)  HB+(aq) +

Chemistry 142 Chapter 15: Acids and Bases

Advanced Acid/Base Theory

ICE ICE Tables. ICE Tables you can determine the concentration at equilibrium of a reactant or product by using ICE tables and the reaction equation.

Equilibrium – Acids and Bases. Review of Acids and Bases Arrhenius Theory of Acids and Bases ▫An acid is a substance that dissociates in water to produce.

Dissociation Constant or Ionization Constant for Weak Acids & Bases When a weak acid, HX, is placed into water some of it reacts with water to form H 3.

Weak Acids and Bases. “WEAK” Acids and bases that ionize less (much less) than 100% The amount of H 3 O + or OH - in solution is MUCH smaller than the.

U2 S2 L2 Kw and pH P Homework: p 569 # 16 – 19 p 572 # 20 – 25 p 574 # 26 – 29 (answers p 581) p 578 #

Due: Acid WS Today: 1.Bases 2.pOH 3.Relationship between pOH and pH HW Base & pOH WS.

Strong and Weak Acids and Bases

BASE IONIZATION Section 8.3. Base-Ionization Constant - K b ■The following equation represents a weak base, B, dissolving in water: ■B (aq) + H 2 O (l)

Acid-Base Titration and pH 1. What ions are associated with acids? Bases? 2.What mathematical operation is the pH scale based on? 3.What is the pH scale?

+ Acids and Bases – K b 2.2K: Define Ka, Kb and use these to determine pH, pOH, [H 3 O + ] and [OH – ] of acidic and basic solutions 2.3K: Calculate equilibrium.

Chapter 8.7 Acid-Base Titration

WARM UP What is the pH of a M weak acid (HA) solution that is 8.2% ionized?

Calculations Involving Acidic and Basic Solutions

Chapter 8.4 Calculations Involving Acidic Solutions

Chemistry 1011 TOPIC TEXT REFERENCE Acids and Bases

16.1 Acid – Ionization.

Hydronium Ions and Hydroxide Ions

Autoionization of Water

Ch Strength of Acids & Bases Strengths of Acids & Bases

Can you calculate for acids and bases?

ACIDS AND BASES: Ionization of Water.

ACIDS AND BASES: Dissociation Constants.

Strengths of Acids and Bases

UNDERSTANDING ACIDS and ALKALIS

Acids Lesson 10 Calculating Ka From pH.

Acids and Bases.

ACIDS AND BASES: Dissociation Constants.

Titrations & Ionization Constants

Solutions, Acids, & Bases

Titrations & Ionization Constants

Chapter 15 Applied equilibrium.

Lesson # 8 Acid Equilibrium Calculations

Dissociation Equilibria for weak acids and bases

Dissociation Constants

Strong and Weak Acids and Bases

Presentation transcript:

U2 S2 L4 Ka and Kb calculations p : pH and Ka of a Weak Acid p : The Base Dissociation Constant, Kb Homework: p 591: # 5, 6, 7, 8, 9 and 10 p 595: # 11, 12, 13, 14, 15 and 16 p 597: # 1, 2, 3, 4, 5 and 6 p 617: # 7, 8, 10 and 11

Upon completion of this lesson, you should be able to: calculate the value of one of K a (or K b ) or an equilibrium concentration given all other values for a system. calculate pH (or pOH) given the initial concentration of a weak acid (or weak base) and K a (or K b ). use the quadratic equation to complete K a or K b calculations

Using percent ionization Percent ionization data can only be used for acid concentrations of 0.10 mol/L (see note on bottom of table) Calculate the pH of a 0.10 M solution of methanoic acid.

Finding % ionization: A 0.15 M boric acid solution has a pH of 5.00, calculate the percent ionization of boric acid.

Calculating K A cleaning solution is prepared by dissolving ammonia in water. The equilibrium concentrations of ammonia and hydroxide found to be 0.35 mol/L and mol/L respectively. Calculate K b

Calculation hydronium or hydroxide using K Propanoic acid solution has K a = 1.3 x and an equilibrium concentration of mol/L. Calculate the concentration of hydronium ions and pH at equilibrium.

ICE tables (brrrrrr…!) A nitrous acid solution has an initial concentration of 0.25 mol/L. At equilibrium the hydronium concentration is mol/L. Calculate K a.

Calculation Ka from pH An aqueous methanoic acid solution has an initial molar concentration of 0.75 M. The pH of the solution at equilibrium is Calculate the K a of a methanoic acid.

An aqueous 0.50 mol/L sodium sulfite solution is prepared. The pH at equilibrium is Calculate the K b for the sulfite ion.

Quadratic equation. A mol/L aspirin (acetylsalicylic acid) solution is made by dissolving a mg tablet in about 125 mL of water. A condensed formula for aspirin is C 8 H 7 O 2 COOH. Given K a for aspirin is 3.3 x 10 -4, calculate the pH of the aspirin solution

Calculate the pH of a 0.50 mol/L ethanoic acid solution