pH

pH Scale Typical values range from 0 to 14 pH = 7 – neutral pH > 7 – basic pH < 7 – acidic A solution has a pH of 3.5. Is it an acid or a base? A solution has a pH of 7.3. Is it an acid or a base?

pH in Common Solutions

Which of the following below is a strong acid? H3PO4 HC2H3O2 HF HNO3 [Default] [MC Any] [MC All]

Which of the following is a weak base? NH3 KOH Ca(OH)2 NaOH [Default] [MC Any] [MC All]

What color do acids turn litmus paper? green red purple blue [Default] [MC Any] [MC All]

The base plus the accepted proton is the acid base conjugate acid conjugate base [Default] [MC Any] [MC All]

A substance that increases the hydronium ion concentration is a Bronsted-Lowry Acid Bronsted-Lowry Base Arrhenius Acid Arrhenius Base [Default] [MC Any] [MC All]

A substance that accepts a proton is a Bronsted-Lowry Acid Bronsted-Lowry Base Arrhenius Acid Arrhenius Base [Default] [MC Any] [MC All]

What is the acid in the reaction below: HClO4 + H2O  H3O+ + ClO4- [Default] [MC Any] [MC All]

What is the conjugate acid in the equation below: CH3COOH + H2O  H3O+ + CH3COO- [Default] [MC Any] [MC All]

Measurement of Acidity pH represents the power of the Hydrogen Negative logarithm of the H+ concentration (molarity) pH = -log [H+] What is the pH of a solution that has a hydrogen ion concentration of 1x10-7M? pH = -log (1X10-7) pH = 7

What is the pH of 1 x 10-3M of HCl?

What is the pH of 2.4x10-6M H3PO4? What is the pH of 1.7x10-3M H2SO4? What is the pH of 7.2x10-4M HI?

pOH pH + pOH = 14 If the pH is 5, what is the pOH?

What if you are asked to find the pH of a base? What is the pH of 1x10-4 NaOH? 1. calculate the pOH by using pOH = -log[OH-] pOH = -log(1x10-4) pOH = 4 2. pH + pOH = 14 pH + 4 = 14 pH = 10

What is the pH of 3.9 x 10-4M of NaOH? What is the pH of 1.4x10-2M of Mg(OH)2? 3. What is the pOH of 6.7x10-3M of LiOH?

What is the pOH of a 5.3x10-4M solution of HCl? 1. pH = -log[H+] pH = -log(5.3x10-4) pH = 3.28 2. pH + pOH = 14 pOH = 10.72

What is the pH of a 1X10-8M solution of HCl? 5 6 8 1 [Default] [MC Any] [MC All]

What is the pH of a 1X10-4M solution of NaOH? 6 11 [Default] [MC Any] [MC All]

What is the pH of an HCl solution that has a concentration of 2 What is the pH of an HCl solution that has a concentration of 2.9 x 10-8M? 8 6.46 6 7.54 [Default] [MC Any] [MC All]

What is the pOH of a solution that has a hydronium concentration of 2 What is the pOH of a solution that has a hydronium concentration of 2.6 x 10-4M? 4 3.6 10.4 9.6 [Default] [MC Any] [MC All]

If a solution has a hydrogen ion concentration of 0 If a solution has a hydrogen ion concentration of 0.003, what is the pH? 11.48 2.52 5.66 9.39 [Default] [MC Any] [MC All]

What is the pH if the hydroxide ion concentration is 3.95 x 10-8M? 7.4 3.0 6.6 5.8 [Default] [MC Any] [MC All]

A 1. 8L solution containing 0. 009mol of HCl is prepared A 1.8L solution containing 0.009mol of HCl is prepared. What is the pH of this solution? 1. molarity = moles of solute liters of solution molarity = 0.009mol 1.8L molarity = 0.005M 2. pH = -log[H+] pH = -log(0.005) pH = 2.3

15000ml of a solution containing 0. 0003mol of HNO3 is prepared 15000ml of a solution containing 0.0003mol of HNO3 is prepared. What is the pH of this solution?

[H3O] = antilog (-3) [H3O] = 0.001M or 1x10-3M Calculating the concentration from the pH [H3O+] = antilog (-pH) What is the hydronium concentration of an acid solution having a pH of 3? [H3O] = antilog (-3) [H3O] = 0.001M or 1x10-3M

[H3O+] = antilog (-pH) [OH-] = antilog (-pOH) pH + pOH = 14 What is the hydroxide concentration of a solution that has a pH of 6.3? 1. pH + pOH = 14 6.3 + pOH = 14 pOH = 7.7 2. [OH-] = antilog (-pOH) [OH-] = antilog (-7.7) [OH] = 2.0x10-8M

What is the hydroxide ion concentration of a solution with a pH of 8.5? What is the hydrogen ion concentration of a solution with a pOH of 4.6?

[H3O+][OH-] = 1 x 10-14 If the hydronium ion concentration is 3.4 x 10-5M, what is the hydroxide ion concentration? (3.4x10-5)[OH-] = 1x10-14 [OH-] = 1x10-14 3.4 x10-5 [OH-] = 2.9x10-10M

If the hydroxide ion concentration is 7.9 x 10-3M, what is the hydronium ion concentration?

What is the concentration of KOH if the pH is 8? 1x108 M 1x10-6 M 1x10-10 M 1x10-4 M [Default] [MC Any] [MC All]

What is the hydronium concentration if the hydroxide concentration is 6.1 x 10-11M? 10.21 1.64 x 10-4M 3.79 6.1 x 10-3M [Default] [MC Any] [MC All]

If a solution has a pH of 8.5, what would this solution be classified as? Weak acid Weak base Strong acid Strong base [Default] [MC Any] [MC All]

What is the concentration of HCl if the solution has a pH of 2? 1x10-12 M 1x10-8 M 1x10-2 M 1x10-3 M [Default] [MC Any] [MC All]

What is the hydronium ion concentration for pure water? 7 14 1 x 10-14M 1 x 10-7M [Default] [MC Any] [MC All]

What are the hydronium and hydroxide ion concentrations in a solution that is 1.0x10-4 M H2SO4?

What is the hydronium concentration of an acid solution having a pH of 5.3?

What is the hydronium ion concentration of a solution of H2SO4 with a pH of 2.1? 2.1 x 10-4M [Default] [MC Any] [MC All]

What is the hydroxide ion concentration of a solution that has a pH of 5.2? 8.8M 1.58 x 10-9M 6.31 x 10-6M 4.22 x 10-5M [Default] [MC Any] [MC All]

Indicators Compounds whose colors are sensitive to pH Methyl orange – changes colors with a pH between 3.1 and 4.4 Phenolphthalein – changes colors with a pH between 8.0 and 10.0

Nature’s Indicator Many flowers and plants contain acid/base indicators which change color in response to a change in pH Chemical structure changes when pH changes

If a solution ionizes almost completely to form OH- ions, what is the substance?

What is a conjugate acid/base pair in the following equation What is a conjugate acid/base pair in the following equation? HCN + H2O  H3O + CN-

When the hydroxide ion concentration is greater than the hydronium ion concentration, is the solution an acid or a base?

What is the pH of a 3.2 x 10-6M?

What is the pH of a 1.0 x 10-3M solution of NaOH?