$$ 1.8 \times 10$$^{-5}$$ $$ mol/L

Question 1

According to the Brønsted-Lowry definition, which of the following statements is correct?

Accepted Answer

An acid is a substance that donates a proton.

Question 2

Which of the following pairs correctly represents a conjugate acid-base pair?

Accepted Answer

$$ \mathrm{H_2O} $$ and $$ \mathrm{OH^-} $$

Question 3

Which of the following is NOT a strong acid?

Accepted Answer

$$ \mathrm{CH_3COOH} $$

Question 4

A solution has a $$ [H^+]  of$$ $$ 1.8 	imes 10$$^{-5}$$ $$ mol/L. What is its pH?

Accepted Answer

$$ 5.74 $$

Question 5

Which of the following statements about rainwater is true?

Accepted Answer

Rainwater has a lower pH in colder climates.

Question 6

What is the value of $$ K_w  ($$the ion product of water) at $$ 25 ^\circ \mathrm{C} $$?

Accepted Answer

$$ 1.0 	imes 10$$^{-14}$$ $$

Question 7

If the $$ [OH^-]  in a $$solution is $$ 5.5 	imes 10$$^{-5}$$ $$ mol/L, what is the pOH?

Accepted Answer

$$ 4.26 $$

Question 8

Which of the following is an example of an amphoteric substance?

Accepted Answer

$$ \mathrm{H_2O} $$

Question 9

Which of the following is a strong base?

Accepted Answer

$$ \mathrm{NaOH} $$

Question 10

What is the relationship between pH and pOH in aqueous solution at $$ 25 ^\circ \mathrm{C} $$?

Accepted Answer

$$ \mathrm{pH} + \mathrm{pOH} = 14 $$

Question 11

If a solution is labeled $$ \mathrm{HCl} = 0.15 $$ mol/L, what are the concentrations of $$ [H^+] $$ and $$ [Cl^-] $$?

Accepted Answer

$$ [H^+] = 0.15 $$ mol/L, $$ [Cl^-] = 0.15 $$ mol/L

Question 12

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$ \mathrm{pH} = -\log [H^+] $$

Question 13

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids completely dissociate in water.

Question 14

Which of the following is the conjugate base of $$ \mathrm{$$HCO_3$$^-} $$?

Accepted Answer

$$ \mathrm{CO_3$^{2-}} $$

Question 15

A solution has a pH of $$ 4.74 . $$What is the $$ [H^+] $$ concentration?

Accepted Answer

$$ 1.8 	imes 10$$^{-5}$$ $$ mol/L

Question 16

Which of the following is true for a neutral solution at $$ 25 ^\circ \mathrm{C} $$?

Accepted Answer

$$ [H^+] = [OH^-] $$

Question 17

Which of the following is the correct expression for the ion product of water?

Accepted Answer

$$ K_w = [H^+][OH^-] $$

Question 18

Which of the following is the conjugate acid of $$ \mathrm{SO_4$^{2-}} $$?

Accepted Answer

$$ \mathrm{$$HSO_4$$^-} $$

Question 19

Which of the following best describes the effect of temperature on the pH of pure water?

Accepted Answer

The pH of pure water decreases as temperature increases.

Acids, Bases, and the pH Scale: Study Notes for General Chemistry

Guida di studio - Domande di pratica