$$[\mathrm{H}^+] = 3.2 \times 10$$^{-5}$$\ \mathrm{M}$$

$$[\mathrm{OH}^-] = 1.0 \times 10$$^{-3}$$\ \mathrm{M}$$

Question 1

Which of the following correctly represents the relationship between pH and pOH in aqueous solutions at 25$$^\circC$$?

Accepted Answer

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

Question 2

A solution of $$0.010\ \mathrm{M}$$ HCl is prepared. What is the pH of this solution?

Accepted Answer

$$\mathrm{pH} = 2.0$$

Question 3

Which of the following is a correct formula for calculating the pOH of a strong base solution?

Accepted Answer

$$\mathrm{pOH} = -\log{[\mathrm{OH}^-]}$$

Question 4

If the concentration of $$\mathrm{Ba(OH)_2}$$ solution is $$0.300\ \mathrm{M}$$, what is the pOH?

Accepted Answer

$$\mathrm{pOH} = 0.52$$

Question 5

A $$1.5 	imes 10$$^{-3}$$\ \mathrm{M}$$ solution of LiOH is prepared. What is the pH of the solution?

Accepted Answer

$$\mathrm{pH} = 11.18$$

Question 6

Which of the following statements is true about strong acids and bases in water?

Accepted Answer

They completely ionize in water.

Question 7

Calculate the $$[\mathrm{H}^+] in a $$solution with pH $$= 4.5.$$

Accepted Answer

$$[\mathrm{H}^+] = 3.2 	imes 10$$^{-5}$$\ \mathrm{M}$$

Question 8

A solution has $$[\mathrm{OH}^-] = 2.7 	imes 10$$^{-3}$$\ \mathrm{M}. $$What is the pOH?

Accepted Answer

$$\mathrm{pOH} = 2.57$$

Question 9

Which of the following ions is NOT produced by the dissociation of a strong base?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 10

If the pOH of a solution is $$3.0$$, what is the $$[\mathrm{OH}^-]$$?

Accepted Answer

$$[\mathrm{OH}^-] = 1.0 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 11

A solution has a pH of $$2.5. $$What is its pOH?

Accepted Answer

$$\mathrm{pOH} = 11.5$$

Question 12

Which of the following best describes the pH of a $$1.0 	imes 10$$^{-7}$$\ \mathrm{M}$$ HCl solution?

Accepted Answer

Slightly less than 7 due to the contribution of $$[\mathrm{H}^+]$$ from water.

Question 13

Which of the following is the correct expression for calculating the pH of a strong acid solution?

Accepted Answer

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

Question 14

A $$0.020\ \mathrm{M}$$ solution of $$\mathrm{Ca(OH)_2} is $$prepared. What is the $$[\mathrm{OH}^-]$$?

Accepted Answer

$$[\mathrm{OH}^-] = 0.040\ \mathrm{M}$$

Question 15

A solution has a pOH of $$5.0. $$What is its pH?

Accepted Answer

$$\mathrm{pH} = 9.0$$

Question 16

Which of the following is a strong base?

Accepted Answer

$$\mathrm{KOH}$$

Question 17

A $$0.0050\ \mathrm{M}$$ solution of $$\mathrm{$$HNO_3$$} is $$prepared. What is the $$[\mathrm{H}^+]$$?

Accepted Answer

$$[\mathrm{H}^+] = 0.0050\ \mathrm{M}$$

Question 18

Which of the following best explains why $$\mathrm{Ba(OH)_2}$$ produces more $$[\mathrm{OH}^-]$$ than $$\mathrm{NaOH} at $$the same molarity?

Accepted Answer

$$\mathrm{Ba(OH)_2}$$ dissociates to give two $$\mathrm{OH}^-$$ ions per formula unit.

Question 19

A solution has $$[\mathrm{H}^+] = 1.0 	imes 10$$^{-5}$$\ \mathrm{M}. $$What is the pOH?

Accepted Answer

$$\mathrm{pOH} = 9.0$$

Question 20

Which of the following is the correct calculation for the pH of a $$2.7 	imes 10$$^{-3}$$\ \mathrm{M}$$ $$\mathrm{NaOH}$$ solution?

Accepted Answer

$$\mathrm{pOH} = -\log{(2.7 	imes 10$$^{-3}$$)}$$, \quad \mathrm{pH} = 14 - \mathrm{pOH}$

pH and pOH of Strong Acids and Bases

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