Presentation is loading. Please wait.

Presentation is loading. Please wait.

Acids Lesson 10 pH Calculations. pHEquations You must know the following equations, which are all based on the ionization of water at 25 0 C! H 2 O ⇄

Published byBryce Harper Modified over 8 years ago

Similar presentations

Presentation on theme: "Acids Lesson 10 pH Calculations. pHEquations You must know the following equations, which are all based on the ionization of water at 25 0 C! H 2 O ⇄"— Presentation transcript:

1 Acids Lesson 10 pH Calculations

2 pHEquations You must know the following equations, which are all based on the ionization of water at 25 0 C! H 2 O ⇄ H + +OH - Kw=[H + ][ OH - ]=1.00 x 10 -14 pH=-Log[H + ]pOH=-Log[OH - ] [H + ]=10 -pH [OH - ]=10 -pOH pH+pOH=pKw=14.000

3 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M Calculation

4 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M CalculationThe number of sig figs are 2 (green)

5 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M CalculationpH = -Log[H + ] pH = -Log[2.5 x 10 -4 ] pH = 3.60 The digit before the decimal does not count as a sig fig. Both digits after the decimal count for 2 sig figs.

6 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M3.60 CalculationpH = -Log[H + ] pH = -Log[2.5 x 10 -4 ] pH = 3.60 keep all digits on the calculator- do not round!

7 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M3.60 CalculationpH + pOH = 14.00 3.60 + pOH = 14.00 pOH = 10.40

8 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M3.6010.40 Calculation[OH - ]=10 -pOH [OH - ]=10 -10.40 [OH - ]=4.0 x 10 -11 M

9 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 CalculationNote that all of the entries in the last line have two sig figs!

10 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 9.435 CalculationpH + pOH = 14.000 9.435 + pOH = 14.000 pOH = 4.565

11 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 9.4354.565 Calculation[OH - ]=10 -pOH [OH - ]=10 -4.565 [OH - ]=2.72 x 10 -5 M

12 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 2.72 x 10 -5 M9.4354.565 Calculation[H + ][OH - ]=1.00 x 10 -14 [H + ][2.72 x 10 -5 ]=1.00 x 10 -14 [H + ]=3.67 x 10 -10 M

13 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 CalculationNote that all of the entries in the last line have three sig figs!

14 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 2.6 x 10 -4 M CalculationpOH = -Log[OH - ] pOH = -Log[2.6 x 10 -4 ] pOH = 3.59

15 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 2.6 x 10 -4 M3.59 CalculationpH + pOH = 14.000 pH + 3.59 = 14.000 pOH = 10.41

16 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 2.6 x 10 -4 M10.413.59 Calculation[H + ]=10 -pH [H + ]=10 -10.41 [H + ]=3.8 x 10 -11 M

17 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 CalculationNote that all of the entries in the last line have two sig figs!

18 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 8.40

19 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 4.0 x 10 -9 M8.40

20 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 4.0 x 10 -9 M8.40

21 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 2.5 x 10 -6 M4.0 x 10 -9 M8.40

22 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 2.5 x 10 -6 M4.0 x 10 -9 M5.60 8.40

23 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59 2.5 x 10 -6 M4.0 x 10 -9 M5.60 8.40 CalculationNote that all of the entries in the last line have two sig figs!

24 pHCalculations [H + ][OH - ]pHpOH 2.5 x 10 -4 M4.0 x 10 -11 M3.6010.40 acid 3.67 x 10 -10 M2.72 x 10 -5 M9.4354.565basic 3.8 x 10 -11 M 2.6 x 10 -4 M10.413.59basic 2.5 x 10 -6 M4.0 x 10 -9 M5.60 8.40acid If the pH is lower than 7, the solution is acidic! If the pH is greater than 7, the solution is basic!

25 1.Calculate the pH of 0.40 M HI. HI  H + +I - 0.40 M0.40 M0.40 M pH = -Log[H + ] pH = -Log[0.40] pH = 0.40

26 2.Calculate the pH of 0.030 M Ba(OH) 2. Ba(OH) 2  Ba 2+ +2OH - 0.030 M0.030 M0.060 M pOH = -Log[OH - ] pOH = -Log[0.060] pOH = 1.22 pH + pOH = 14.000 pH + 1.22 = 14.000 pH = 12.78

27 3.Calculate the pH of 100.0 mL of 1.0 M HCl after 300.0 mL of water is added to it. HCl  H + +Cl - 1001.0 M 4000.25 M0.25 M pH=0.60

Download ppt "Acids Lesson 10 pH Calculations. pHEquations You must know the following equations, which are all based on the ionization of water at 25 0 C! H 2 O ⇄"

Similar presentations

Chapter 19: Acids and Bases Table of Contents 19.3: What is pH?

Chapter 19: Acids and Bases Table of Contents 19.3: What is pH?
Unique properties of Water Can act as either an acid or a base Weak electrolyte so it is a poor conductor of electricity but does undergo ionization to.

Unique properties of Water Can act as either an acid or a base Weak electrolyte so it is a poor conductor of electricity but does undergo ionization to.
Acid-Base Equilibria pH and pOH Relationship of Conjugate Pair acid-base strength. When acids or bases control pH:  determine K  predict pH When pH controls.

Acid-Base Equilibria pH and pOH Relationship of Conjugate Pair acid-base strength. When acids or bases control pH:  determine K  predict pH When pH controls.
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.

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.
Strong Acid-Base Calculations

Strong Acid-Base Calculations
Acid – Base Review Problems

Acid – Base Review Problems
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.

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.
Chemistry Notes: pH Calculations Chemistry 2014-2015.

Chemistry Notes: pH Calculations Chemistry
PH P ractice Practice Problem # 1 © Mr. D. Scott; CHS If the hydrogen ion concentration of a solution is 2.5 x 10 -5 M, what is the pH of the solution?

PH P ractice Practice Problem # 1 © Mr. D. Scott; CHS If the hydrogen ion concentration of a solution is 2.5 x M, what is the pH of the solution?
Here’s another example calculation question involving these quantities [H 3 O + ], [OH – ], pH, and pOH Calculations Example 2.

Here’s another example calculation question involving these quantities [H 3 O + ], [OH – ], pH, and pOH Calculations Example 2.
Hydrogen Ions and Acidity. Hydrogen Ions from Water Water is highly polar – what does that mean? Water particles are in continuous motion If they possess.

Hydrogen Ions and Acidity. Hydrogen Ions from Water Water is highly polar – what does that mean? Water particles are in continuous motion If they possess.
PROBLEM: You titrate 25.0 mL of 0.10 M NH 3 with 0.10 M HCl. (a) What is the pH of NH 3 solution before the titration begins? (b) What is the pH at the.

PROBLEM: You titrate 25.0 mL of 0.10 M NH 3 with 0.10 M HCl. (a) What is the pH of NH 3 solution before the titration begins? (b) What is the pH at the.
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.

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 & Bases Lesson 5 pH scale. H and OH There is a way we can connect both H and OH together, using what we already know about them. We know: Kw = [H.

Acids & Bases Lesson 5 pH scale. H and OH There is a way we can connect both H and OH together, using what we already know about them. We know: Kw = [H.
Section 16.2 Determining the Acidity of a Solution 1.To understand pH and pOH 2.To learn to find pH and pOH for various solutions 3.To use a calculator.

Section 16.2 Determining the Acidity of a Solution 1.To understand pH and pOH 2.To learn to find pH and pOH for various solutions 3.To use a calculator.
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. 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 =
14.3 pH Scale 14.4 pH of Strong Acids

14.3 pH Scale 14.4 pH of Strong Acids
Acids Lesson 8 Application of Hydrolysis pH Calculations.

Acids Lesson 8 Application of Hydrolysis pH Calculations.
Acids Lesson 12 Calculating Ka From pH. 1.The pH of 0.100 M H 2 C 2 O 4 is 1.28. Calculate the Ka for the weak acid.

Acids Lesson 12 Calculating Ka From pH. 1.The pH of M H 2 C 2 O 4 is Calculate the Ka for the weak acid.
Acid-Base Equilibria pH and pOH Relationship of Conjugate Pair acid-base strength. When acids or bases control pH:  determine K  predict pH When pH controls.

Acid-Base Equilibria pH and pOH Relationship of Conjugate Pair acid-base strength. When acids or bases control pH:  determine K  predict pH When pH controls.

Similar presentations

Ads by Google