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Quiz about Concepts of Acids and Bases
Quiz about Concepts of Acids and Bases

Concepts of Acids and Bases Trivia Quiz


This quiz tests your knowledge of the theories of acidity/basicity and measuring the strength of acids and bases. Some calculation questions are included, so please take your time.

A multiple-choice quiz by pokho. Estimated time: 6 mins.
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Author
pokho
Time
6 mins
Type
Multiple Choice
Quiz #
398,834
Updated
Dec 03 21
# Qns
10
Difficulty
Tough
Avg Score
5 / 10
Plays
178
-
Question 1 of 10
1. According to the Brønsted-Lowry theory of proton transfer, an acid is a donor of protons, while a base is an acceptor of protons.


Question 2 of 10
2. What would be the conjugate base of the conjugate base of sulfuric acid (H2SO4)? Hint


Question 3 of 10
3. Water can act both as an acid or a base according to Brønsted-Lowry theory, either giving out or taking a proton. What are such substances also known to be? Hint


Question 4 of 10
4. At conditions of Standard Temperature and Pressure, how much does the pH and pOH of a substance add up to? Hint


Question 5 of 10
5. The pH of water at 373 K (boiling point) is 6.14. This means that water has turned acidic.


Question 6 of 10
6. When an acid has reacted with a carbonate, which of the following are you probably NOT going to get back as a PRODUCT? Hint


Question 7 of 10
7. What is the difference between the pH levels of a strong acid and a strong base both at a concentration of 10 moles per liter? Hint


Question 8 of 10
8. You have nitric acid at the concentration of 10^-8 moles per liter. What is going to be its pH level? Hint


Question 9 of 10
9. You have two solutions with equal volumes and equal concentrations of ethanoic acid and sulfuric acid. If you would like to know which one's which, which of the following is the most appropriate method? Hint


Question 10 of 10
10. What pH range would you expect rainwater (without pollution) to lie in? Hint



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Quiz Answer Key and Fun Facts
1. According to the Brønsted-Lowry theory of proton transfer, an acid is a donor of protons, while a base is an acceptor of protons.

Answer: True

Do not mix the two up!

Although it has been well-known for some time what acids and bases can do, and certain reactions have been associated with them before that, there was no concrete articulation of the phenomenon of acidity and basicity.
One of the earlier theories of acidity/basicity was the Arrhenius theory, according to which acids release hydrogen ions when dissolved in water while bases release hydroxide ions.

Another theory was the Lewis theory of acids and bases, according to which the classification of substances into acidic and basic was based on the acceptance and donation of pairs of electrons respectively.

Note that neither of the mentioned theories negates the others, though they have their respective pros and cons.
2. What would be the conjugate base of the conjugate base of sulfuric acid (H2SO4)?

Answer: SO4 ^(2-)

The conjugate base of a Brønsted-Lowry acid is simply a proton deducted from the acid. Vice versa, the conjugate acid of a Brønsted-Lowry base is a proton added to the acid.

Eg:- H3O ^ (+) is the conjugate acid of H2O.
3. Water can act both as an acid or a base according to Brønsted-Lowry theory, either giving out or taking a proton. What are such substances also known to be?

Answer: Amphiprotic

Water being considered an acid or a base instead of being a neutral substance may sound strange, but we are using Brønsted-Lowry theory here. Accordingly we classify acids and bases upon the transfer of protons (hydrogen ions).

An example of water acting as a Brønsted-Lowry acid would be:-
NH3 + H2O ⇄ NH4^(+) + OH^(-)

An example of water acting as a Brønsted-Lowry base would be:-
HCl + H2O ⇄ Cl^(-) + H3O^(+)
4. At conditions of Standard Temperature and Pressure, how much does the pH and pOH of a substance add up to?

Answer: 14.00

1 * 10^-14 is the value of the ionization constant of water at STP - and the amount of hydrogen or hydroxide ions produced are the inverses of each other. The pH and pOH values are indefinite, but their sum is not.
5. The pH of water at 373 K (boiling point) is 6.14. This means that water has turned acidic.

Answer: False

Water, like other neutral substances, has both a pH and pOH of 7 at room temperature. The pH and pOH scales tell us the amount of hydrogen and hydroxide ion concentrations respectively. However, with increasing temperature, more of the concerned substance may disassociate into ions, hence the lower pH of water at 373 K.

This doesn't mean that water is acidic at this temperature as the pOH is also 6.14; the ratio of hydrogen and hydroxide ions is equal.
6. When an acid has reacted with a carbonate, which of the following are you probably NOT going to get back as a PRODUCT?

Answer: Hydrogen gas

A reaction between a carbonate and the acid creates a salt, carbon dioxide and water.

Hydrogen gas is produced when the acid reacts with metal.

It is possible to get magnesium chloride while reacting magnesium carbonate and hydrochloric acid, as per the following reaction:-

MgCO3 + 2HCl -> MgCl2 + CO2 + H2O
7. What is the difference between the pH levels of a strong acid and a strong base both at a concentration of 10 moles per liter?

Answer: 16

The pH of the strong acid = -log (Concentration of Hydrogen ion) [base of log is 10]
= -log 10
= -1
The pOH of the strong base would similarly be -1.
Remember that pH + pOH of same substance at STP = 14
Then pH of the base = 14 - pOH = 14 - (-1) = 15
The difference is thus 15 - (-1) = 16

As we can see, the pH of an acid can go below 0 and that of a base can go above 14.
8. You have nitric acid at the concentration of 10^-8 moles per liter. What is going to be its pH level?

Answer: Slightly less than 7

pH= -log (Concentration of Hydrogen ions) [base of log is 10]

But pay further attention before mechanically applying this formula!

Acid being present at a very low concentration is not going to be a base which turns your litmus paper blue.

The concentration of hydrogen ions here is less than water (which has 10^ -7 moles per liter). Nitric Acid is, we can safely assume, in an aqueous solution. It is not going to lower the hydrogen ion concentration, but increase it slightly.

To find the pH in such cases, you need to first add the hydrogen ion concentrations of water and nitric acid:-
10^-8 + 10^-7 = 1.1 * 10^-7 moles per liter
We can now apply the formula, getting us a pH of about 6.96.
9. You have two solutions with equal volumes and equal concentrations of ethanoic acid and sulfuric acid. If you would like to know which one's which, which of the following is the most appropriate method?

Answer: Electrolysis, and measurement of electric current

I would highly discourage trying the taste test with sulfuric acid for safety concerns. (You may lose the ability to do it again...).

Ethanoic acid, aka acetic acid, is a weak acid used in vinegar and sulfuric acid, also known as battery acid, is a strong acid. Strong acids completely disassociate in water while weak acids, only partially.

Provided they have the same concentration, it is the strong acid which is going to have more hydrogen ions - hence stronger conductivity. And hence, lower resistance and higher current when you use an ammeter. Both are acids, so both may turn your litmus paper red.

Since the acids themselves are present in equal volumes and concentrations, it follows that there is a similar amount of the uniprotic acids which are going to neutralise an equal amount of base.

Another possible method which would have been measurement of rates of reaction, the sulfuric acid reacting much more vigorously.
10. What pH range would you expect rainwater (without pollution) to lie in?

Answer: 5 to 6

Rain is naturally acidic due to the presence of carbon dioxide from respiration and combustion naturally taking place, which combines with rainwater to form carbonic acid, a weak acid.

Rainfall below pH 5.6 is said to be acid rain, when pollutants like the oxides of sulfur and nitrogen combine with water to form sulfurous, nitrous, sulfuric and nitric acids. The oxides come from the internal combustion engines of vehicles and fossil fuels in power generation plants.
Source: Author pokho

This quiz was reviewed by FunTrivia editor rossian before going online.
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