Question

What is the pH of a solution if [H₃O⁺] = 4.1 x 10^-5 M?

Question 26 options:

	1.9
	2.7
	2.4
	1.7
	4.4

Question 27 (3 points)

Which one of the following is characteristic of a base?

Question 27 options:

1)	produces H3O+ in water

2)	has a sour taste

3)	produces OH− ions in solution

4)	turns blue litmus red

5)	is insoluble in water

Question 28 (3 points)

What is the percent by mass %(m/m) concentration of solution if 13.020 g of glucose were dissolved in a solution with a mass of 150.0 g?

Your Answer:Question 28 options:

Answer	units

Question 29 (3 points)

The Arrhenius definition states that if HNO3were dissolved in water, it would act as

Question 29 options:

1)

a base.

2)

an acid.

3)	a source of hydroxide ions.

4)	a source of H- ions.

5)	a proton acceptor.

Question 30 (3 points)

When diluting a solution,

Question 30 options:

1)	the amount of solute does not change.

2)	the amount of solvent does not change.

3)	there is more solute in the concentrated solution.

4)	the volume of the solution does not change.

5)	water is removed from the concentrated solution.

Question 31 (3 points)

Henry's law states that the solubility of a gas in a liquid

Question 31 options:

1)	decreases as the gas pressure above the liquid increases.

2)	increases as the gas pressure above the liquid increases.

3)	remains the same as the temperature increases.

4)	depends on the liquid polarity.

5)	depends on the liquid density.

Question 32 (3 points)

What is the name of the process in which a solid phase transitions directly to a gas?

Question 32 options:

1)

freezing.

2)

melting.

3)

boiling.

4)	condensation.

5)	sublimation.

Answer 1

26)

Given:

[H3O+] = 4.1*10^-5 M

use:

pH = -log [H3O+]

= -log (4.1*10^-5)

= 4.3872

Answer: 4.39

27)

Base produces OH- in water

Answer: option 3

option 1 is characteristics of acid.

option 2 is characteristics of acid

option 4 is characteristics of acid

option 5 is not correct.

28)

%m/m = mass of glucose * 100 / mass of solution

= 13.020 * 100 / 150.0

= 8.680 g

Answer: 8.680 g

29)

HNO3 when dissolved in water gives:

HNO3 —> H+ + NO3-

HNO3 releases H+ and hence acts as acid

Answer: option 2

Only 1 question at a time please