Calculating pH SCH3U/4C Ms. richardson.

Slides:

Advertisements

Similar presentations

Hydrogen Ions and Acidity

Advertisements

Ways to measure Acidity/Basicity What is pH? What is pOH?

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

Acids and Bases. Ionization of Water H 2 O + H 2 O H 3 O + + OH - K w = [H 3 O + ][OH - ] = 1.0 

Wake-up Write down each equation below. Identify the base (B), acid (A), conjugate acid (CA), and conjugate base (CB). 1.NH 3 + HCN  NH 4 + CN 1.HSO 4.

The pH Scale & pH Calculations Chemistry 10 Mrs. Page.

pH scale Logarithmic scale expressing the H + concentration, [H + ]. If the pH changes by a factor of 1, the [H + ] changes by a factor of 10. pH =

PH. In any solution the H 3 O + and OH - concentration is always very small. pH- method of representing the H 3 O + concentration in a solution. pH =

PH – A Measure of Acidity and Basicity Logarithm: In mathematics, the logarithm of a number is the exponent to which another fixed value, the base, must.

pH and pOH Ionization of water Experiments have shown that pure water ionizes very slightly: 2H 2 O  H 3 O + + OH - Measurements show that: [H 3 O +

Ch. 18: Acids & Bases Sec. 18.3: What is pH?. Objectives n Explain the meaning of pH and pOH. n Relate pH and pOH to the ion product constant for water.

Kw, pH, and pOH calculations

DO NOW: What is pH a measure of?. The pH scale pH  pH is the -log of the hydrogen ion concentration  Mathematically it is represented by the equation:

Chapter 16 Acid-Base Titration and pH. Aqueous Solutions and the Concept of pH Self-ionization of water – 2 water molecules produce a hydronium ion and.

PH. The Ion product constant for water H 2 O (l) + H 2 O (l)  H 3 O + (aq) + OH − (aq) Dissociation of water is an equilibrium, and since liquid water.

PH ( power of hydronium ion). The pH scale is a way of expressing the strength of acids and bases. Instead of using very small numbers, we just use the.

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

C. Johannesson Ch. 15 & 16 - Acids & Bases II. pH (p )

Acids & Bases pH. Ionization of Water H 2 O + H 2 O H 3 O + + OH - K w = [H 3 O + ][OH - ] = 1.0  Kw=ionization constant for H2O.

 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.

A bit more on the pH scale. (molar concentrations of H + and OH - ions) ACIDS BASES Contain greater number of H+ ions than OH- ions pH of (0-6.9)) Contain.

Strengths of Acids and Bases

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.

Acids and Bases By Samantha King. What is an acid? According to Bronsted and Lowry, an acid is any chemical component with a pH less than 7, and that.

PH. Ionization of Water  When compounds dissociate/ionize in an aqueous solution, they produce ions - hydronium (H 3 O + ) and hydroxide (OH - )  These.

Acids, Bases, and pH.

Aim: How to determine if a solution is acidic, basic, or neutral

Warm-Up 12/16/2016 A mixture of gases (NO2,CO2, SO2) is collected in a bottle. The partial pressure of NO2 is 1.25 atm, and the partial pressure of.

PH calculations More in depth than you need for 1st year, but requests were made, so here goes.

Acid and Bases.

Molarity, Dilution, and pH

Topic: Acids and Bases (Part 2)

Calculating pH.

Unit 2: Biochemistry Chapter 2

Self Ionization of Water and the pH Scale

Ionization Constant of Water

Hydronium Ions and Hydroxide Ions

Hydronium Ions and Hydroxide Ions

Lesson 2 pH and pOH Acid Neutral Base.

Lesson 2 pH and pOH Acid Neutral Base.

Chapter 9 Acids and Bases

The pH scale and what does it mean?

Calculating Concentration

Calculating Acidity.

Acids and Bases.

Hydrogen Ions and Acidity

Chapter 15 Preview Lesson Starter Objectives

PH Scale Søren Sørensen (1868–1939).

pH Scale Definition of Acids and Bases

Unit 13 – Acid, Bases, & Salts

Calculating Concentration

Calculating pH from the Water Constant

PH and Concentrations.

Acids and Bases.

Calculating Acidity.

PH and pOH Acid Neutral Base.

Unit 13 – Acid, Bases, & Salts

Calculating pH and pOH.

Calculating pH (and pOH)

Unit 15 – Acid, Bases, & Salts

Unit 13 – Acid, Bases, & Salts

DO NOW Pick up notes. You need a calculator today.

Unit 5- lecture 5 Using the pH scale to characterize acids and bases.

Unit 13 – Acid, Bases, & Salts

Ch. 14 & 15 - Acids & Bases II. pH.

Intro to Acids & Bases.

Presentation transcript:

Calculating pH SCH3U/4C Ms. richardson

The Power of Hydrogen pH stands for the “power of hydrogen” It is a way of indicating the concentration of hydrogen ions present in a solution. The scale is logarithmic, based on factors of 10.

The pH Scale The pH scale ranges from 0-14. A pH of 7 means that the substance is neutral. The pH scale is a logarithmic function of the concentration of H+ As a result, each whole pH value below 7 is ten times more acidic than the next higher value. The same holds true for pH values above 7, each of which is ten times more alkaline (basic)

pH and Concentration Pure water has a hydrogen ion concentration of about 1 X 10-7 mol/L. [H+] = 1 X 10-7 mol/L. In an acidic solution, [H+] > 1 X 10-7 mol/l In a basic solution, [H+] < 1 X 10-7 mol/l

Calculating pH To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+]

Example Find the pH of a 0.0025 M HCl solution. (Remember - HCl fully ionizes in solution) pH = - log (0.0025) = - ( - 2.60) = 2.60

Calculating H+ Concentration The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH)

Example What is the hydronium ion concentration in a solution that has a pH of 8.34? 8.34 = - log [H3O+] - 8.34 = log [H3O+] [H3O+] = 10-8.34 = 4.57 x 10-9 M