GED CHEMISTRY 101 PREPARATION TEST
2026 QUESTIONS AND CORRECT ANSWERS
GRADED A+
● The concentration of hydronium ion is equal to the concentration of
the hydroxide ion. Answer: [H_3O^+] = [OH^-]
● The ion-product constant of water. Answer: K_w
● In pure water at 25 degrees C. Answer: 1.0x10^-14
● pH. Answer: pH is the negative logarithm of the hydrogen ion
concentration (in M): pH= -log[H_3O^+]
● Neutralization Reaction. Answer: an acid reacts with a base
● To predict the formula of the salt produced:. Answer: - remove all H+
ions from the acid to find the anion
- remove all OH- ions from the base to find the cation
- combine the cation and anion to obtain the formula of the salt (charges
must balance)
, ● To write a balanced chemical equation:. Answer: - write the formula
of the acid and base as reactants
- draw a reaction arrow
- write the formulas of the salt and water
- balance the equation
● When an acid reacts with ammonia or an amine:. Answer: an
ammonium salt is produced
● Buffer. Answer: a solution that resists changes in pH upon the
addition of small amounts of acid or base
● Buffer Action. Answer: buffer solutions resist changes in pH
● Buffer capacity. Answer: a measure of the amount of H3O+ or OH-
ions that a buffer can absorb without a significant change in its pH
● Acid-base Homeostasis. Answer: maintenance of proper pH level in
the body
- buffering systems in the blood maintain pH balance between 7.35 and
7.45
- the primary buffering system is a carbonic acid/carbonate ion buffer
maintained by the kidneys and lungs
2026 QUESTIONS AND CORRECT ANSWERS
GRADED A+
● The concentration of hydronium ion is equal to the concentration of
the hydroxide ion. Answer: [H_3O^+] = [OH^-]
● The ion-product constant of water. Answer: K_w
● In pure water at 25 degrees C. Answer: 1.0x10^-14
● pH. Answer: pH is the negative logarithm of the hydrogen ion
concentration (in M): pH= -log[H_3O^+]
● Neutralization Reaction. Answer: an acid reacts with a base
● To predict the formula of the salt produced:. Answer: - remove all H+
ions from the acid to find the anion
- remove all OH- ions from the base to find the cation
- combine the cation and anion to obtain the formula of the salt (charges
must balance)
, ● To write a balanced chemical equation:. Answer: - write the formula
of the acid and base as reactants
- draw a reaction arrow
- write the formulas of the salt and water
- balance the equation
● When an acid reacts with ammonia or an amine:. Answer: an
ammonium salt is produced
● Buffer. Answer: a solution that resists changes in pH upon the
addition of small amounts of acid or base
● Buffer Action. Answer: buffer solutions resist changes in pH
● Buffer capacity. Answer: a measure of the amount of H3O+ or OH-
ions that a buffer can absorb without a significant change in its pH
● Acid-base Homeostasis. Answer: maintenance of proper pH level in
the body
- buffering systems in the blood maintain pH balance between 7.35 and
7.45
- the primary buffering system is a carbonic acid/carbonate ion buffer
maintained by the kidneys and lungs
