Pre-test

Who developed definitions of acids and bases based on the compounds’ abilities to either donate or accept protons (H⁺H⁺ ions)?

• Arrhenius and Highry                                              

• Bronsted and Lowry

• Bronsted and Arrhenius

• Lowry and Highry

What do we call a compound that acts as both a Bronsted-Lowry acid and base together?

           

• amphiprotic

• amphoteric

• conjugate acid

• conjugate base

What concept was introduced by Søren Sørensen in 1909 that is now commonly used to quantify the

            acidity or basicity of a substance, specifically regarding the expression of the hydrogen-ion

            the concentration of a solution?

• The concept of pH as a measure of acidity or basicity.

• The use of litmus paper to test for the presence of acid or base in a solution.

• The use of the Arrhenius theory to explain the behavior of acids and bases in aqueous solution.

• The idea of titration is a technique used to determine the concentration of a solution by reacting it with a known concentration of another solution.

Which of the following is the correct formula for getting the pH of a solution?

• pH = -log[H+]

• pH = log[H+]     

• pH = [H+] / log

• pH = log [OH-]

Which of the following statements is CORRECT about water's acid-base property?

                 I. A water molecule will accept a proton and thus act as a Bronsted-Lowry base.

                 II. A water molecule can donate a proton and thus act as a Bronsted-Lowry acid.

                 III. A water molecule can act as an acid or a base even in a sample of pure water.

• I only

• I and II

• I and III

• I, II and III

In the equation, which compound is considered the conjugate base?

•  C₆H₅NH₂                           

• C₆H₅NH₃⁺

• OH^-  

• H₂O

Hair stylists recommend slightly acidic and near-neutral shampoo for smoother hair. You find 5 brands that you like. The first has a pH of 3.6, the second of 13, the third of 8.2, the fourth of 6.8, and the fifth of 9.7. Which one should you buy?

• The shampoo with a pH of 3.6                                    

• The shampoo with a pH of 13

• The shampoo with a pH of 8.2  

• The shampoo with a pH of 6.8

What is the importance of determining the pH of a solution?

                 

• It determines the color of the solution.

• It measures the temperature of the solution.

• It is a measure of the acidity or basicity of the solution.

• It helps to determine the concentration of solute in the solution.

If you solve the pH of a 0.0235 M HCl solution, which of the following is correct?

               

• 1.629 

• 1.648

• 1.734

• 1. 790

If you solve for the pH of a solution with a pOH of 1.56, which is the correct answer?

• 12.44

• 12.55

• 12.57

• 13.45