Page 1 S.3.6 - Describe Concepts of Acids and Bases

Question 1

A substance with a pH less than 7

Answer 1

Acid

Question 2

A substance with a pH greater than 7

Answer 2

Base

Question 3

A logarithmic scale based on the amount or concentration of hydrogen ions (H+) in a solution, calculated as pH = –log[H+] and used to express acidity or basicity.

Answer 3

pH

Question 4

A chemical reaction in which mixing an acid with a base causes the H+ from the acid to combine with the OH– from the base, forming water

Answer 4

neutralization reaction

Question 5

Which of the following substances is an example of an acid:

HI
CO2
NH3
KCl​​​​​​​

Answer 5

HI

HI is hydroiodic acid, and in water it dissociates, forming H+ and I-.

CO2 does not produce or donate H+ in water; if anything, it can be seen to accept H+.

NH3 is a base.
KCI is an ionic compound.

Question 6

Orange juice, stomach acid, and coffee are all acids. Which of the following is the pH level for these substances?​​​​​​​

Answer 6

A pH less than 7

Acids have a pH lower than 7.

Question 7

Predict the outcome of the neutralization reaction: H2SO4 + Ca(OH)2 →

Answer 7

H2SO4 + Ca(OH)2 → 2H2O+ CaSO4​​​​​​​