Test Your Acid-base Knowledge Quiz
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In chemistry class over the past days we have covered acids and bases, how to write chemical equations and what we get when we mixes the two. The quiz below is designed to test your Acid-base knowledge and ensure you are ready for any question posed to you on the topic. Give it a try and see what you score.
- 1.
An acid will dissociate (release) _______ ions in water.
- A.
Hydrogen
- B.
Hydroxide
- C.
Chloride
- D.
Oxide
Correct Answer
A. HydrogenExplanation
Acids release hydrogen ions when they are dissolved in water. This process is known as dissociation. When an acid dissociates, it forms hydrogen ions (H+) and anions. Therefore, the correct answer is hydrogen.Rate this question:
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- 2.
A base will dissociate (release) __________ ions in water.
- A.
Hydrogen
- B.
Hydroxide
- C.
Chloride
- D.
Oxide
Correct Answer
B. HydroxideExplanation
A base will dissociate (release) hydroxide ions in water. This is because hydroxide ions (OH-) are the characteristic component of bases. When a base is dissolved in water, it breaks apart into hydroxide ions and a positive ion. The hydroxide ions then interact with water molecules, forming a basic solution. Therefore, the correct answer is hydroxide.Rate this question:
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- 3.
An acid's pH is
- A.
Less than 7
- B.
Equal to 7
- C.
Greater than 7
Correct Answer
A. Less than 7Explanation
An acid's pH is less than 7 because acids are substances that release hydrogen ions (H+) when dissolved in water. The concentration of H+ ions determines the acidity of a solution. A pH value below 7 indicates that the concentration of H+ ions is higher, making the solution acidic.Rate this question:
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- 4.
A base's pH is
- A.
Less than 7
- B.
Equal to 7
- C.
Greater than 7
Correct Answer
C. Greater than 7Explanation
A base's pH is greater than 7 because bases are substances that can accept hydrogen ions (H+) in a solution. The pH scale ranges from 0 to 14, where 7 is considered neutral. A pH value greater than 7 indicates a higher concentration of hydroxide ions (OH-) in the solution, which is characteristic of bases. Therefore, a base's pH is greater than 7.Rate this question:
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- 5.
A neutral solution has a pH ________
- A.
Less than 7
- B.
Equal to 7
- C.
Greater than 7
Correct Answer
B. Equal to 7Explanation
A neutral solution has a pH equal to 7 because pH is a measure of the concentration of hydrogen ions in a solution. A pH of 7 indicates that the concentration of hydrogen ions is equal to the concentration of hydroxide ions, resulting in a balanced solution. This means that the solution is neither acidic nor basic, making it neutral.Rate this question:
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- 6.
Bases taste
- A.
Sweet
- B.
Sour
- C.
Tangy
- D.
Bitter
Correct Answer
D. BitterExplanation
Bases taste bitter because they have a higher pH level and can release hydroxide ions. This bitter taste is often associated with alkaline substances such as baking soda or soap.Rate this question:
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- 7.
An indicator changes color based on changes in
- A.
Amount of liquid
- B.
Density
- C.
PH
Correct Answer
C. pHExplanation
The correct answer is pH because pH is a measure of the acidity or alkalinity of a solution. Different pH levels can cause indicators to change color, indicating whether the solution is acidic, neutral, or alkaline. The amount of liquid and density do not directly affect the pH of a solution, so they are not the correct answers.Rate this question:
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- 8.
pH paper is a good indicator because
- A.
It has a vial to match pH values
- B.
It changes a wide variety of colors to indicate the pH
- C.
It is easy to use
- D.
It is paper not a liquid
Correct Answer
B. It changes a wide variety of colors to indicate the pHExplanation
pH paper is a good indicator because it changes a wide variety of colors to indicate the pH. This means that it can accurately show the pH level of a substance by displaying a specific color. This range of colors allows for a more precise measurement and interpretation of the pH value. Additionally, the ability to easily observe and distinguish between different colors makes it a convenient and user-friendly tool for pH testing.Rate this question:
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- 9.
Poinsettia pigment is better indicator than pH paper.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Poinsettia pigment is not a better indicator than pH paper. pH paper is specifically designed to measure the acidity or alkalinity of a solution by changing color based on the pH level. It provides a more accurate and reliable measurement compared to poinsettia pigment, which is not specifically designed for pH measurement and may not provide accurate results. Therefore, the statement is false.Rate this question:
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- 10.
Acids can cause burns, bases cannot.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Bases can also cause burns, just like acids. Both acids and bases are corrosive substances that can cause damage to the skin and other tissues. The severity of the burn depends on the concentration and strength of the acid or base. Therefore, the statement that bases cannot cause burns is incorrect.Rate this question:
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- 11.
A volume of 543mL of 0.5M HCl neutralizes a solution of 0.75M NaOH. What volume of NaOH was neutralized? Ma * Va = Mb * Vb
- A.
203.625mL
- B.
362mL
- C.
814.5mL
- D.
135.75mL
Correct Answer
B. 362mLExplanation
The equation Ma * Va = Mb * Vb is the balanced equation for a neutralization reaction, where Ma is the molarity of acid (HCl), Va is the volume of acid used, Mb is the molarity of base (NaOH), and Vb is the volume of base used. We are given the values for Ma (0.5M) and Va (543mL) for HCl, and Mb (0.75M) is given for NaOH. We need to find Vb, the volume of NaOH used. By rearranging the equation, we can solve for Vb: Vb = (Ma * Va) / Mb. Plugging in the given values, we get Vb = (0.5M * 543mL) / 0.75M = 362mL. Therefore, the correct answer is 362mL.Rate this question:
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- 12.
A volume of 55mL of 2.0M NaOH is neutralized with 230mL of HCl. What is the concentration of the HCl? Ma * Va = Mb * Vb
- A.
0.48M
- B.
25300M
- C.
8.36M
- D.
87.5 M
Correct Answer
A. 0.48MExplanation
The equation Ma * Va = Mb * Vb is the equation for the dilution formula, where Ma is the initial concentration of the solution being diluted, Va is the initial volume of the solution being diluted, Mb is the final concentration of the diluted solution, and Vb is the final volume of the diluted solution. In this case, the initial concentration of NaOH is 2.0M and the initial volume is 55mL. The final volume is the sum of the initial volumes of NaOH and HCl, which is 55mL + 230mL = 285mL. The final concentration of HCl can be calculated using the formula as follows: 2.0M * 55mL = Mb * 285mL. Solving for Mb gives us a concentration of 0.48M.Rate this question:
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- 13.
Which of the following is a BASE?
- A.
HCl
- B.
HF
- C.
KOH
- D.
HBr
Correct Answer
C. KOHExplanation
KOH is a base because it is a hydroxide compound. Bases are substances that can accept protons (H+) or donate hydroxide ions (OH-) in a chemical reaction. In the case of KOH, it dissociates in water to form potassium ions (K+) and hydroxide ions (OH-). The hydroxide ions make it a base as they can react with acids to form water and a salt.Rate this question:
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- 14.
Neutralization is when
- A.
There is more acid than base
- B.
There is more base than acid
- C.
There is equal amounts of acid and base
- D.
Has nothing to do with acid/base
Correct Answer
C. There is equal amounts of acid and baseExplanation
Neutralization is a chemical reaction that occurs when there are equal amounts of acid and base present. During neutralization, the acid and base react with each other to form a salt and water, resulting in a neutral pH. This reaction is commonly used to neutralize acidic or basic solutions and is an important process in various industries and laboratory settings.Rate this question:
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- 15.
If you are performing a neutralization reaction and you forget to add an indicator (such as phenolthalein) what will happen?
- A.
Your solution will turn too pink
- B.
It doesn't matter, you don't need an indicator
- C.
You will not be able to tell when it is neutralized because there is no color change
- D.
It will only turn color if it is really acidic or really basic
Correct Answer
C. You will not be able to tell when it is neutralized because there is no color changeExplanation
If you forget to add an indicator during a neutralization reaction, you will not be able to tell when it is neutralized because there is no color change. Indicators are used to visually determine the endpoint of a reaction by changing color, indicating that the solution has reached a neutral pH. Without an indicator, you won't have a visual cue to indicate the completion of the reaction and the neutral pH state.Rate this question:
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- 16.
If you are performing a neutralization reaction, using phenolphthalein, and you add too much base your solution will
- A.
Be clear
- B.
Smell
- C.
Be too pink
- D.
Be dark blue
Correct Answer
C. Be too pinkExplanation
If you add too much base during a neutralization reaction using phenolphthalein, the solution will become too pink. Phenolphthalein is a pH indicator that turns pink in the presence of a base. Adding an excessive amount of base will cause the solution to become excessively pink, indicating that the reaction is not properly balanced and there is an excess of base present.Rate this question:
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- 17.
In the equation Ma * Va = Mb * Vb Ma stands for
- A.
Mass of acid
- B.
Density of acid
- C.
Concentration of acid
- D.
Volume of acid
Correct Answer
C. Concentration of acidExplanation
In the equation Ma * Va = Mb * Vb, Ma stands for the concentration of acid. This is because the equation represents the principle of conservation of mass in a chemical reaction, where the mass of the acid (Ma) multiplied by its volume (Va) is equal to the mass of the base (Mb) multiplied by its volume (Vb). Therefore, Ma represents the concentration of the acid, as it is the ratio of the mass of the acid to its volume.Rate this question:
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- 18.
Bases turn ___________ in litmus.
- A.
Clear
- B.
Pink
- C.
Blue
- D.
Green
Correct Answer
C. BlueExplanation
Litmus paper is a commonly used indicator in chemistry to determine whether a substance is acidic or basic. When a base is added to litmus paper, it turns blue. This is because litmus paper is made from a natural dye called litmus, which is extracted from lichens. In the presence of a base, the litmus dye undergoes a chemical reaction that causes it to change color to blue. Therefore, the correct answer is blue.Rate this question:
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- 19.
Acids taste
- A.
Sweet
- B.
Sour
- C.
Bitter
- D.
Tangy
Correct Answer
B. SourExplanation
Acids taste sour because they release hydrogen ions (H+) when dissolved in water. These hydrogen ions react with taste receptors on our tongue, sending signals to our brain that are interpreted as sour taste. This is why sour foods like lemons and vinegar are often acidic.Rate this question:
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- 20.
A volume of 87mL of 1.0M NaOH is neutralized with 65mL of HCl. What is the concentration of the HCl? Ma * Va = Mb * Vb
- A.
1.3M
- B.
0.75M
- C.
22M
- D.
152 M
Correct Answer
A. 1.3MExplanation
The equation Ma * Va = Mb * Vb is used to calculate the concentration of a solution. In this case, the volume (Va) and concentration (Ma) of NaOH are given as 87mL and 1.0M, respectively. The volume (Vb) of HCl used to neutralize the NaOH is given as 65mL. By plugging these values into the equation, we can solve for the concentration (Mb) of HCl. The correct answer is 1.3M.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 14, 2010Quiz Created by
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